send message body ... Error, session timed out

[M10CUBE]

Thank you for your great library.

I am trying all day to figure out why this is happening.
The program sending plan email works fine but the program sending attached files not.
I am using

• Arduino IDE 2.
• • SD card with one image file and one text file already written
• ESP32 minikit

here is the debug messages:

22:29:52.777 -> < S: 250-8BITMIME
22:29:52.777 -> < S: 250-DSN
22:29:52.777 -> < S: 250 CHUNKING
22:29:52.777 ->
22:29:52.777 -> #### Logging in...
22:29:52.777 -> > C: send SMTP command, AUTH PLAIN
22:29:52.777 -> > C: vorrias@pan-gaea.gr
22:29:52.777 -> > C: **************
22:30:03.292 -> < S: 235 2.7.0 Authentication successful
22:30:03.292 ->
22:30:03.292 -> Successfully logged in.
22:30:03.292 ->
22:30:03.292 -> #### Sending Email...
22:30:03.292 -> > C: send Email
22:30:03.292 ->
22:30:03.292 -> #### Sending message header...
22:30:03.292 -> > C: send message header
22:30:04.708 -> < S: 250 2.1.0 Ok
22:30:04.997 -> < S: 250 2.1.5 Ok
22:30:04.997 ->
22:30:04.997 -> #### Sending message body...
22:30:04.997 -> > C: send message body
22:30:35.006 -> > C: cleaning SSL connection
22:30:35.037 -> #### Error, session timed out
22:30:35.037 -> ! E: session timed out
22:30:35.037 ->
22:30:35.037 -> #### -------------------------
22:30:35.037 -> #### Message sent success: 0
22:30:35.037 -> #### Message sent failed: 1
22:30:35.037 -> #### -------------------------
22:30:35.037 -> #### Status: failed
22:30:35.037 -> #### Date/Time: January 01, 1970 00:00:00
22:30:35.037 -> #### Recipient: vorrias.argo@gmail.com
22:30:35.037 -> #### Subject: Test sending Email with attachments and inline

here is my code

/**
 * This example shows how to send Email with attachments and  inline images stored in SD card.
 *
 * Created by K. Suwatchai (Mobizt)
 *
 * Email: suwatchai@outlook.com
 *
 * Github: https://github.com/mobizt/ESP-Mail-Client
 *
 * Copyright (c) 2023 mobizt
 *
 */

/** ////////////////////////////////////////////////
 *  Struct data names changed from v2.x.x to v3.x.x
 *  ////////////////////////////////////////////////
 *
 * "ESP_Mail_Session" changes to "Session_Config"
 * "IMAP_Config" changes to "IMAP_Data"
 *
 * Changes in the examples
 *
 * ESP_Mail_Session session;
 * to
 * Session_Config config;
 *
 * IMAP_Config config;
 * to
 * IMAP_Data imap_data;
 *
 */

/** Assign SD card type and FS used in src/ESP_Mail_FS.h and
 * change the config for that card interfaces in src/extras/SDHelper.h
 */

#include <Arduino.h>
#if defined(ESP32) || defined(ARDUINO_RASPBERRY_PI_PICO_W)
#include <WiFi.h>
#elif defined(ESP8266)
#include <ESP8266WiFi.h>
#else

// Other Client defined here
// To use custom Client, define ENABLE_CUSTOM_CLIENT in src/ESP_Mail_FS.h.
// See the example Custom_Client.ino for how to use.

#endif

#include <ESP_Mail_Client.h>

#define SPI_CS_PIN 5
#define SPI_SCK_PIN 18
#define SPI_MISO_PIN 19
#define SPI_MOSI_PIN 23
#define SPI_CLOCK_IN_MHz 16

// Provide the SD card interfaces setting and mounting
#include <extras/SDHelper.h>

// To use only SMTP functions, you can exclude the IMAP from compilation, see ESP_Mail_FS.h.

#define WIFI_SSID "XXX"
#define WIFI_PASSWORD "XXX"

/** For Gmail, the app password will be used for log in
 *  Check out https://github.com/mobizt/ESP-Mail-Client#gmail-smtp-and-imap-required-app-passwords-to-sign-in
 *
 * For Yahoo mail, log in to your yahoo mail in web browser and generate app password by go to
 * https://login.yahoo.com/account/security/app-passwords/add/confirm?src=noSrc
 *
 * To use Gmai and Yahoo's App Password to sign in, define the AUTHOR_PASSWORD with your App Password
 * and AUTHOR_EMAIL with your account email.
 */

/** The smtp host name e.g. smtp.gmail.com for GMail or smtp.office365.com for Outlook or smtp.mail.yahoo.com */

#define SMTP_HOST "XXX"
#define SMTP_PORT 465
#define AUTHOR_EMAIL "XXX"
#define AUTHOR_PASSWORD "XXX"
#define RECIPIENT_EMAIL "XXX"

/* Declare the global used SMTPSession object for SMTP transport */
SMTPSession smtp;

/* Callback function to get the Email sending status */
void smtpCallback(SMTP_Status status);

#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
WiFiMulti multi;
#endif

void setup()
{
  Serial.begin(115200);
#if defined(ARDUINO_ARCH_SAMD)
  while (!Serial)
    ;
  Serial.println();
  Serial.println("**** Custom built WiFiNINA firmware need to be installed.****\n");
  Serial.println("To install firmware, read the instruction here, https://github.com/mobizt/ESP-Mail-Client#install-custom-build-wifinina-firmware");
#endif

  Serial.println();

#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
  multi.addAP(WIFI_SSID, WIFI_PASSWORD);
  multi.run();
#else
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
#endif

  Serial.print("Connecting to Wi-Fi");
      
#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
    unsigned long ms = millis();
#endif

  while (WiFi.status() != WL_CONNECTED)
  {
    Serial.print(".");
    delay(300);
#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
    if (millis() - ms > 10000)
      break;
#endif
  }
  Serial.println();
  Serial.print("Connected with IP: ");
  Serial.println(WiFi.localIP());
  Serial.println();
/*

  /*  Set the network reconnection option */
  MailClient.networkReconnect(true);

  // The WiFi credentials are required for Pico W
  // due to it does not have reconnect feature.
#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
  MailClient.clearAP();
  MailClient.addAP(WIFI_SSID, WIFI_PASSWORD);
#endif

  /** Enable the debug via Serial port
   * 0 for no debugging
   * 1 for basic level debugging
   *
   * Debug port can be changed via ESP_MAIL_DEFAULT_DEBUG_PORT in ESP_Mail_FS.h
   */
  smtp.debug(1);

  /* Set the callback function to get the sending results */
  smtp.callback(smtpCallback);

  /* Declare the Session_Config for user defined session credentials */
  Session_Config config;

  /* Set the session config */
  config.server.host_name = SMTP_HOST;
  config.server.port = SMTP_PORT;
  config.login.email = AUTHOR_EMAIL;
  config.login.password = AUTHOR_PASSWORD;

  /** Assign your host name or you public IPv4 or IPv6 only
   * as this is the part of EHLO/HELO command to identify the client system
   * to prevent connection rejection.
   * If host name or public IP is not available, ignore this or
   * use generic host "mydomain.net".
   *
   * Assign any text to this option may cause the connection rejection.
   */
  config.login.user_domain = F("pan-gaea.gr");

  /*
  Set the NTP config time
  For times east of the Prime Meridian use 0-12
  For times west of the Prime Meridian add 12 to the offset.
  Ex. American/Denver GMT would be -6. 6 + 12 = 18
  See https://en.wikipedia.org/wiki/Time_zone for a list of the GMT/UTC timezone offsets
  */
  config.time.ntp_server = F("pool.ntp.org,time.nist.gov");
  config.time.gmt_offset = 3;
  config.time.day_light_offset = 0;

  /* Declare the message class */
  SMTP_Message message;

  /* Enable the chunked data transfer with pipelining for large message if server supported */
  message.enable.chunking = true;

  /* Set the message headers */
  message.sender.name = F("ESP Mail");
  message.sender.email = AUTHOR_EMAIL;

  message.subject = F("Test sending Email with attachments and inline images from SD card and Flash");

  message.addRecipient(F("user1"), RECIPIENT_EMAIL);

  /** Two alternative content versions are sending in this example e.g. plain text and html */
  String htmlMsg = "<span style=\"color:#ff0000;\">This message contains 1 inline image and 1 attachment file.</span><br/><br/><img src=\"orange.png\" width=\"100\" height=\"100\">";

  message.html.content = htmlMsg;

  /** The HTML text message character set e.g.
   * us-ascii
   * utf-8
   * utf-7
   * The default value is utf-8
   */
  message.html.charSet = F("utf-8");

  /** The content transfer encoding e.g.
   * enc_7bit or "7bit" (not encoded)
   * enc_qp or "quoted-printable" (encoded)
   * enc_base64 or "base64" (encoded)
   * enc_binary or "binary" (not encoded)
   * enc_8bit or "8bit" (not encoded)
   * The default value is "7bit"
   */
  message.html.transfer_encoding = Content_Transfer_Encoding::enc_7bit;

  message.text.content = F("This message contains 1 inline image and 1 attachment file.\r\nThe inline image will not show in the plain text message.");

  message.text.charSet = F("utf-8");
  message.text.transfer_encoding = Content_Transfer_Encoding::enc_base64;

  /** The message priority
   * esp_mail_smtp_priority_high or 1
   * esp_mail_smtp_priority_normal or 3
   * esp_mail_smtp_priority_low or 5
   * The default value is esp_mail_smtp_priority_low
   */
  message.priority = esp_mail_smtp_priority::esp_mail_smtp_priority_normal;

  /** The Delivery Status Notifications e.g.
   * esp_mail_smtp_notify_never
   * esp_mail_smtp_notify_success
   * esp_mail_smtp_notify_failure
   * esp_mail_smtp_notify_delay
   * The default value is esp_mail_smtp_notify_never
   */
  // message.response.notify = esp_mail_smtp_notify_success | esp_mail_smtp_notify_failure | esp_mail_smtp_notify_delay;

  /* Set the custom message header */
  message.addHeader(F("Message-ID: <user1@gmail.com>"));

  /* The attachment data item */
  SMTP_Attachment att[2];
  int attIndex = 0;

  /** Set the inline image info e.g.
   * file name, MIME type, file path, file storage type,
   * transfer encoding and content encoding
   */

  
  
  


  att[attIndex].descr.filename = F("logo.jpg");
  att[attIndex].descr.mime = F("image/jpg");
  att[attIndex].file.path = F("/logo.jpg");
  /** The file storage type e.g.
   * esp_mail_file_storage_type_none,
   * esp_mail_file_storage_type_flash, and
   * esp_mail_file_storage_type_sd
   */
  att[attIndex].file.storage_type = esp_mail_file_storage_type_sd;

  /* Need to be base64 transfer encoding for inline image */
  att[attIndex].descr.transfer_encoding = Content_Transfer_Encoding::enc_base64;
  /** The orange.png file is already base64 encoded file.
   * Then set the content encoding to match the transfer encoding
   * which no encoding was taken place prior to sending.
   */

  /* Add inline image to the message */
  message.addInlineImage(att[attIndex]);

  /** Set the attachment info e.g.
   * file name, MIME type, file path, file storage type,
   * transfer encoding and content encoding
   */

  attIndex++;
  att[attIndex].descr.filename = F("SE001.txt");
  att[attIndex].descr.mime = F("text/plain"); 
  att[attIndex].descr.description = F("This is plain text");
  att[attIndex].file.path = F("/SE001.txt");
  att[attIndex].file.storage_type = esp_mail_file_storage_type_sd;
  att[attIndex].descr.transfer_encoding = Content_Transfer_Encoding::enc_base64;

  /* Add attachment to the message */
  message.addAttachment(att[attIndex]);

  /* Connect to the server */
  if (!smtp.connect(&config))
  {
    ESP_MAIL_PRINTF("Connection error, Status Code: %d, Error Code: %d, Reason: %s", smtp.statusCode(), smtp.errorCode(), smtp.errorReason().c_str());
    return;
  }

  if (smtp.isAuthenticated())
    Serial.println("\nSuccessfully logged in.");
  else
    Serial.println("\nConnected with no Auth.");

  /* Start sending the Email and close the session */
  if (!MailClient.sendMail(&smtp, &message, true))
    ESP_MAIL_PRINTF("Error, Status Code: %d, Error Code: %d, Reason: %s", smtp.statusCode(), smtp.errorCode(), smtp.errorReason().c_str());
  
  // to clear sending result log
  // smtp.sendingResult.clear();

  ESP_MAIL_PRINTF("Free Heap: %d\n", MailClient.getFreeHeap());
}

void loop()
{
}

/* Callback function to get the Email sending status */
void smtpCallback(SMTP_Status status)
{
  /* Print the current status */
  Serial.println(status.info());

  /* Print the sending result */
  if (status.success())
  {
    // ESP_MAIL_PRINTF used in the examples is for format printing via debug Serial port
    // that works for all supported Arduino platform SDKs e.g. AVR, SAMD, ESP32 and ESP8266.
    // In ESP8266 and ESP32, you can use Serial.printf directly.

    Serial.println("----------------");
    ESP_MAIL_PRINTF("Message sent success: %d\n", status.completedCount());
    ESP_MAIL_PRINTF("Message sent failed: %d\n", status.failedCount());
    Serial.println("----------------\n");

    for (size_t i = 0; i < smtp.sendingResult.size(); i++)
    {
      /* Get the result item */
      SMTP_Result result = smtp.sendingResult.getItem(i);

      // In case, ESP32, ESP8266 and SAMD device, the timestamp get from result.timestamp should be valid if
      // your device time was synched with NTP server.
      // Other devices may show invalid timestamp as the device time was not set i.e. it will show Jan 1, 1970.
      // You can call smtp.setSystemTime(xxx) to set device time manually. Where xxx is timestamp (seconds since Jan 1, 1970)

      ESP_MAIL_PRINTF("Message No: %d\n", i + 1);
      ESP_MAIL_PRINTF("Status: %s\n", result.completed ? "success" : "failed");
      ESP_MAIL_PRINTF("Date/Time: %s\n", MailClient.Time.getDateTimeString(result.timestamp, "%B %d, %Y %H:%M:%S").c_str());
      ESP_MAIL_PRINTF("Recipient: %s\n", result.recipients.c_str());
      ESP_MAIL_PRINTF("Subject: %s\n", result.subject.c_str());
    }
    Serial.println("----------------\n");

    // You need to clear sending result as the memory usage will grow up.
    smtp.sendingResult.clear();
  }
}

Any help will be greatly appreciated.
Thank you

[mobizt]

You should mount your SD card first using this function.

ESP-Mail-Client/examples/SMTP/Send_Attachment_File/Send_Attachment_File.ino

Line 144 in 1f72c36

SD_Card_Mounting(); // See src/extras/SDHelper.h

And in this case error is at your networks included internet, router and your WiFi range.

[M10CUBE]

Thank you @mobizt ,
I solve the SD card issue following your directions.
I have now writen exactly your example ( Send_Attachment_File.ino ).
I am able now to see the two files written in SD (bin1.dat & orange.png ). That means SD is working OK
The connection to server is OK but still when it comes to sending the body I have the same error

C: SSL/TLS negotiation
C: seeding the random number generator
C: setting up the SSL/TLS structure
! W: Skipping SSL Verification. INSECURE!
C: setting hostname for TLS session
C: perform the SSL/TLS handshake
C: verifying peer X.509 certificate

SMTP server connected

C: SMTP server connected, wait for greeting...
< S: 220 server.linux83.papaki.gr ESMTP Postfix

Sending greeting response...

C: send SMTP command, EHLO
< S: 250-server.linux83.papaki.gr
< S: 250-PIPELINING
< S: 250-SIZE 41943040
< S: 250-ETRN
< S: 250-AUTH DIGEST-MD5 CRAM-MD5 PLAIN LOGIN
< S: 250-ENHANCEDSTATUSCODES
< S: 250-8BITMIME
< S: 250-DSN
< S: 250 CHUNKING

Logging in...

C: send SMTP command, AUTH PLAIN
C: vorrias@pan-gaea.gr
C: **************
< S: 235 2.7.0 Authentication successful

Successfully logged in.

Sending Email...

C: send Email

Sending message header...

C: send message header
< S: 250 2.1.0 Ok
< S: 250 2.1.5 Ok

Sending message body...

C: send message body
C: cleaning SSL connection

Error, session timed out

! E: session timed out

-------------------------

Message sent success: 0

Message sent failed: 1

-------------------------

Status: failed

Date/Time: January 01, 1970 00:00:00

Recipient: vorrias.argo@gmail.com

Subject: Test sending Email with attachments and inline images from SD card and Flash

Error, Status Code: 0, Error Code: -401, Reason: session timed outFree Heap: 209752

Could that be a problem with the provider? Not allowing attached file when SSL is not present?

Sorry to bother you but I have a project in the other part of Greece to install a noise sensor and that is very crucial to solve.
I understand you are defiantly busy
Thank you

[mobizt]

Library works normally which it tested intensively and frequently.

To make sure all are up to date, please update library and ESP32 core SDK and post the full debug message starting from WiFI connection.

The flash filesystem also works well which you can try this example.

[mobizt]

If you see this invalid date/time

22:30:35.037 -> #### Date/Time: January 01, 1970 00:00:00

This means you are using many years ago obsoleted version library.

You should see the message about NTP time reading in the serial monitor and time should be valid otherwise the server will reject your message.

Even in no attachment example, if your device time was not set correctly, server may reject your message and quits the connection during the message body was sent.

[mobizt]

After I review your code and see that your library may up to date but It is strange that your device time was not set correctly which the debug message about this is missing from your post.

And you should post the full debug message.

In the case of NTP reading (synching) failure, it is because internet connection problem or unreliable internet and you should check and try to reset your router, replace your AP or your device.

[M10CUBE]

OK @mobizt here we are now:

[M10CUBE]

• ESP32 core only can update to 2.09. In 2.10 update ESP32 keeps rebooting.
• the "plain" sent email program you have in ypour example works without a problem and send the email (see debug code below)
• The updated program that send the attached file always stack on sending the body. then time out. I thing bay be that is related to provider?
• I even put it close to WiFi acces point sot the signal to be strong.

as you see both programs reporting connection with the mail server OK.

Now I may ask the provider for the attached issue
I will try the google account . Is that working ot do I have security problems.
As far as using the ESP32 flash I have a little problem . This is not supported in Arduino 2. . Of course I can role back to Arduino 1.8 but that will be no use because I have files about 3MB to sent. I also considering using SDfat (you supported as I see). Everybody says it is better.

HERE IS THE DEBUG SENDING PLAIN MESSAGE works OK

---

[12:44:22:180] ets Jun 8 2016 00:22:57␍␊
[12:44:22:180] ␍␊
[12:44:22:180] rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)␍␊
[12:44:22:180] configsip: 0, SPIWP:0xee␍␊
[12:44:22:180] clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00␍␊
[12:44:22:180] mode:DIO, clock div:1␍␊
[12:44:22:180] load:0x3fff0030,len:1184␍␊
[12:44:22:180] load:0x40078000,len:13220␍␊
[12:44:22:214] ho 0 tail 12 room 4␍␊
[12:44:22:214] load:0x40080400,len:3028␍␊
[12:44:22:214] entry 0x400805e4␍␊
[12:44:22:599] ␍␊
[12:44:22:671] ␍␊
[12:44:22:671] Brownout detector was triggered␍␊
[12:44:22:671] ␍␊
[12:44:22:694] ets Jun 8 2016 00:22:57␍␊
[12:44:22:694] ␍␊
[12:44:22:694] rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)␍␊
[12:44:22:694] configsip: 0, SPIWP:0xee␍␊
[12:44:22:694] clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00␍␊
[12:44:22:694] mode:DIO, clock div:1␍␊
[12:44:22:694] load:0x3fff0030,len:1184␍␊
[12:44:22:694] load:0x40078000,len:13220␍␊
[12:44:22:721] ho 0 tail 12 room 4␍␊
[12:44:22:721] load:0x40080400,len:3028␍␊
[12:44:22:721] entry 0x400805e4␍␊
[12:44:23:112] ␍␊
[12:44:23:237] Connecting to Wi-Fi........␍␊
[12:44:25:647] Connected with IP: 192.168.1.252␍␊
[12:44:25:647] ␍␊
[12:44:25:647] #### Connecting to SMTP server...␍␊
[12:44:25:647] > C: ESP Mail Client v3.2.0␍␊
[12:44:25:647] > C: Reading time from NTP server␍␊
[12:44:27:904] > C: connecting to SMTP server␍␊
[12:44:27:904] > C: Host > linux83.papaki.gr␍␊
[12:44:27:904] > C: Port > 465␍␊
[12:44:27:994] ␍␊
[12:44:27:994] > C: SSL/TLS negotiation␍␊
[12:44:27:994] > C: seeding the random number generator␍␊
[12:44:27:994] > C: setting up the SSL/TLS structure␍␊
[12:44:27:994] ! W: Skipping SSL Verification. INSECURE!␍␊
[12:44:27:994] > C: setting hostname for TLS session␍␊
[12:44:27:994] > C: perform the SSL/TLS handshake␍␊
[12:44:37:890] > C: verifying peer X.509 certificate␍␊
[12:44:37:890] ␍␊
[12:44:37:890] #### SMTP server connected␍␊
[12:44:37:890] > C: SMTP server connected, wait for greeting...␍␊
[12:44:38:095] < S: 220 server.linux83.papaki.gr ESMTP Postfix␍␊
[12:44:38:095] ␍␊
[12:44:38:095] #### Sending greeting response...␍␊
[12:44:38:095] > C: send SMTP command, EHLO␍␊
[12:44:38:401] < S: 250-server.linux83.papaki.gr␍␊
[12:44:38:401] < S: 250-PIPELINING␍␊
[12:44:38:401] < S: 250-SIZE 41943040␍␊
[12:44:38:401] < S: 250-ETRN␍␊
[12:44:38:425] < S: 250-AUTH DIGEST-MD5 CRAM-MD5 PLAIN LOGIN␍␊
[12:44:38:425] < S: 250-ENHANCEDSTATUSCODES␍␊
[12:44:38:425] < S: 250-8BITMIME␍␊
[12:44:38:425] < S: 250-DSN␍␊
[12:44:38:425] < S: 250 CHUNKING␍␊
[12:44:38:425] ␍␊
[12:44:38:425] #### Logging in...␍␊
[12:44:38:425] > C: send SMTP command, AUTH PLAIN␍␊
[12:44:38:425] > C: vorrias@pan-gaea.gr␍␊
[12:44:38:425] > C: **************␍␊
[12:44:42:913] < S: 235 2.7.0 Authentication successful␍␊
[12:44:42:913] ␊
[12:44:42:913] Successfully logged in.␍␊
[12:44:42:913] ␍␊
[12:44:42:913] #### Sending Email...␍␊
[12:44:42:913] > C: send Email␍␊
[12:44:42:913] ␍␊
[12:44:42:913] #### Sending message header...␍␊
[12:44:42:913] > C: send message header␍␊
[12:44:43:218] < S: 250 2.1.0 Ok␍␊
[12:44:45:463] < S: 250 2.1.5 Ok␍␊
[12:44:45:463] ␍␊
[12:44:45:463] #### Sending message body...␍␊
[12:44:45:463] > C: send message body␍␊
[12:44:46:921] < S: 354 End data with .␍␊
[12:44:46:932] ␍␊
[12:44:46:932] #### Finishing the message sending...␍␊
[12:44:46:932] > C: finishing the message sending␍␊
[12:44:47:513] < S: 250 2.0.0 Ok: queued as 60060885D05␍␊
[12:44:47:513] ␍␊
[12:44:47:513] #### Closing the session...␍␊
[12:44:47:513] > C: terminate the SMTP session␍␊
[12:44:47:763] ␍␊
[12:44:47:763] #### Message sent successfully␍␊
[12:44:47:763] > C: message sent successfully␍␊
[12:44:47:763] ␍␊
[12:44:47:763] ----------------␍␊
[12:44:47:763] Message sent success: 1␊
[12:44:47:763] Message sent failed: 0␊
[12:44:47:763] ----------------␊
[12:44:47:763] ␍␊
[12:44:47:763] Message No: 1␊
[12:44:47:763] Status: success␊
[12:44:47:763] Date/Time: July 19, 2023 12:44:03␊
[12:44:47:763] Recipient: vorrias.argo@gmail.com␊
[12:44:47:763] Subject: ESP Test Email␊
[12:44:47:786] ----------------␊
[12:44:47:786] ␍␊
[12:44:47:786] > C: cleaning SSL connection␍␊

THIS IS THE PROGRAM TO SEND THE FILE. File is writen in SD and checked (image can not be read fro PC but that is no problem i suppose). THIS IS NOT WORKING. TIMEOUT ERROR

/**

• This example shows how to send Email with attachments and inline images stored in SD card.
• Created by K. Suwatchai (Mobizt)
• Email: suwatchai@outlook.com
• Github: https://github.com/mobizt/ESP-Mail-Client
• Copyright (c) 2023 mobizt

*/

/** ////////////////////////////////////////////////

• Struct data names changed from v2.x.x to v3.x.x
• ////////////////////////////////////////////////
• "ESP_Mail_Session" changes to "Session_Config"
• "IMAP_Config" changes to "IMAP_Data"
• Changes in the examples
• ESP_Mail_Session session;
• to
• Session_Config config;
• IMAP_Config config;
• to
• IMAP_Data imap_data;

*/

/** Assign SD card type and FS used in src/ESP_Mail_FS.h and

• change the config for that card interfaces in src/extras/SDHelper.h
  */

#include <Arduino.h>
#if defined(ESP32) || defined(ARDUINO_RASPBERRY_PI_PICO_W)
#include <WiFi.h>
#elif defined(ESP8266)
#include <ESP8266WiFi.h>
#else

// Other Client defined here
// To use custom Client, define ENABLE_CUSTOM_CLIENT in src/ESP_Mail_FS.h.
// See the example Custom_Client.ino for how to use.

#endif

#include <ESP_Mail_Client.h>

// Provide the SD card interfaces setting and mounting
#include <extras/SDHelper.h>

#define WIFI_SSID "LABX"
#define WIFI_PASSWORD "XXX"
#define SMTP_HOST "linux83.papaki.gr"
#define SMTP_PORT 465
#define AUTHOR_EMAIL "XXX"
#define AUTHOR_PASSWORD "XXX"
#define RECIPIENT_EMAIL "vorrias.argo@gmail.com"

/** For Gmail, the app password will be used for log in

• Check out https://github.com/mobizt/ESP-Mail-Client#gmail-smtp-and-imap-required-app-passwords-to-sign-in
• For Yahoo mail, log in to your yahoo mail in web browser and generate app password by go to
• https://login.yahoo.com/account/security/app-passwords/add/confirm?src=noSrc
• To use Gmai and Yahoo's App Password to sign in, define the AUTHOR_PASSWORD with your App Password
• and AUTHOR_EMAIL with your account email.
  */

/** The smtp host name e.g. smtp.gmail.com for GMail or smtp.office365.com for Outlook or smtp.mail.yahoo.com */

/* Declare the global used SMTPSession object for SMTP transport */
SMTPSession smtp;

/* Callback function to get the Email sending status */
void smtpCallback(SMTP_Status status);

#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
WiFiMulti multi;
#endif

void setup()
{

Serial.begin(115200);

#if defined(ARDUINO_ARCH_SAMD)
while (!Serial)
;
Serial.println();
Serial.println("**** Custom built WiFiNINA firmware need to be installed.****\n");
Serial.println("To install firmware, read the instruction here, https://github.com/mobizt/ESP-Mail-Client#install-custom-build-wifinina-firmware");
#endif

Serial.println();

#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
multi.addAP(WIFI_SSID, WIFI_PASSWORD);
multi.run();
#else
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
#endif

Serial.print("Connecting to Wi-Fi");

#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
unsigned long ms = millis();
#endif

while (WiFi.status() != WL_CONNECTED)
{
Serial.print(".");
delay(300);
#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
if (millis() - ms > 10000)
break;
#endif
}
Serial.println();
Serial.print("Connected with IP: ");
Serial.println(WiFi.localIP());
Serial.println();

#if defined(ESP_MAIL_DEFAULT_SD_FS) // defined in src/ESP_Mail_FS.h

// Mount SD card.
SD_Card_Mounting(); // See src/extras/SDHelper.h

Serial.println("Preparing SD file attachments...");

const char *orangeImg = "iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAYAAABw4pVUAAAAoUlEQVR42u3RMQ0AMAgAsCFgftHLiQpsENJaaFT+fqwRQoQgRAhChCBECEKECBGCECEIEYIQIQgRghCECEGIEIQIQYgQhCBECEKEIEQIQoQgBCFCECIEIUIQIgQhCBGCECEIEYIQIQhBiBCECEGIEIQIQQhChCBECEKEIEQIQhAiBCFCECIEIUIQghAhCBGCECEIEYIQIUKEIEQIQoQg5LoBGi/oCaOpTXoAAAAASUVORK5CYII=";

// Write demo data to file

static uint8_t buf[512];

// SDFat?
#if defined(ESP_MAIL_USE_SDFAT) // ESP_MAIL_USE_SDFAT is auto defined when you set to use SdFat in src/ESP_Mail_FS.h
SdFile file;
file.open("/orange.png", O_RDWR | O_CREAT);
file.print(orangeImg);
file.close();

file.open("/bin1.dat", O_RDWR | O_CREAT);
buf[0] = 'H';
buf[1] = 'E';
buf[2] = 'A';
buf[3] = 'D';
file.write(buf, 4);

size_t i;

for (i = 0; i < 4; i++)
{
memset(buf, i + 1, 512);
file.write(buf, 512);
}

buf[0] = 'T';
buf[1] = 'A';
buf[2] = 'I';
buf[3] = 'L';
file.write(buf, 4);
file.close();

#else

#if defined(ESP32)
File file = ESP_MAIL_DEFAULT_SD_FS.open("/orange.png", FILE_WRITE);
#else
File file = ESP_MAIL_DEFAULT_SD_FS.open("/orange.png", "w");
#endif
file.print(orangeImg);
file.close();

#if defined(ESP32)
file = ESP_MAIL_DEFAULT_SD_FS.open("/bin1.dat", FILE_WRITE);
#else
file = ESP_MAIL_DEFAULT_SD_FS.open("/bin1.dat", "w");
#endif

buf[0] = 'H';
buf[1] = 'E';
buf[2] = 'A';
buf[3] = 'D';
file.write(buf, 4);

size_t i;

for (i = 0; i < 4; i++)
{
memset(buf, i + 1, 512);
file.write(buf, 512);
}

buf[0] = 'T';
buf[1] = 'A';
buf[2] = 'I';
buf[3] = 'L';
file.write(buf, 4);
file.close();
#endif

#endif

/* Set the network reconnection option */
MailClient.networkReconnect(true);

// The WiFi credentials are required for Pico W
// due to it does not have reconnect feature.
#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
MailClient.clearAP();
MailClient.addAP(WIFI_SSID, WIFI_PASSWORD);
#endif

/** Enable the debug via Serial port

• 0 for no debugging
• 1 for basic level debugging
• Debug port can be changed via ESP_MAIL_DEFAULT_DEBUG_PORT in ESP_Mail_FS.h
  */
  smtp.debug(1);

/* Set the callback function to get the sending results */
smtp.callback(smtpCallback);

/* Declare the Session_Config for user defined session credentials */
Session_Config config;

/* Set the session config */
config.server.host_name = SMTP_HOST;
config.server.port = SMTP_PORT;
config.login.email = AUTHOR_EMAIL;
config.login.password = AUTHOR_PASSWORD;

/** Assign your host name or you public IPv4 or IPv6 only

• as this is the part of EHLO/HELO command to identify the client system
• to prevent connection rejection.
• If host name or public IP is not available, ignore this or
• use generic host "mydomain.net".
• Assign any text to this option may cause the connection rejection.
  */
  config.login.user_domain = F("mydomain.net");

/*
Set the NTP config time
For times east of the Prime Meridian use 0-12
For times west of the Prime Meridian add 12 to the offset.
Ex. American/Denver GMT would be -6. 6 + 12 = 18
See https://en.wikipedia.org/wiki/Time_zone for a list of the GMT/UTC timezone offsets
*/
config.time.ntp_server = F("pool.ntp.org,time.nist.gov");
config.time.gmt_offset = 3;
config.time.day_light_offset = 0;

/* Declare the message class */
SMTP_Message message;

/* Enable the chunked data transfer with pipelining for large message if server supported */
message.enable.chunking = true;

/* Set the message headers */
message.sender.name = F("ESP Mail");
message.sender.email = AUTHOR_EMAIL;

message.subject = F("Test sending Email with attachments and inline images from SD card and Flash");

message.addRecipient(F("user1"), RECIPIENT_EMAIL);

/** Two alternative content versions are sending in this example e.g. plain text and html */
String htmlMsg = "<span style="color:#ff0000;">This message contains 1 inline image and 1 attachment file.

<img src="orange.png" width="100" height="100">";

message.html.content = htmlMsg;

/** The HTML text message character set e.g.

• us-ascii
• utf-8
• utf-7
• The default value is utf-8
  */
  message.html.charSet = F("utf-8");

/** The content transfer encoding e.g.

• enc_7bit or "7bit" (not encoded)
• enc_qp or "quoted-printable" (encoded)
• enc_base64 or "base64" (encoded)
• enc_binary or "binary" (not encoded)
• enc_8bit or "8bit" (not encoded)
• The default value is "7bit"
  */
  message.html.transfer_encoding = Content_Transfer_Encoding::enc_qp;

message.text.content = F("This message contains 1 inline image and 1 attachment file.\r\nThe inline image will not show in the plain text message.");

message.text.charSet = F("utf-8");
message.text.transfer_encoding = Content_Transfer_Encoding::enc_base64;

/** The message priority

• esp_mail_smtp_priority_high or 1
• esp_mail_smtp_priority_normal or 3
• esp_mail_smtp_priority_low or 5
• The default value is esp_mail_smtp_priority_low
  */
  message.priority = esp_mail_smtp_priority::esp_mail_smtp_priority_normal;

/** The Delivery Status Notifications e.g.

• esp_mail_smtp_notify_never
• esp_mail_smtp_notify_success
• esp_mail_smtp_notify_failure
• esp_mail_smtp_notify_delay
• The default value is esp_mail_smtp_notify_never
  */
  // message.response.notify = esp_mail_smtp_notify_success | esp_mail_smtp_notify_failure | esp_mail_smtp_notify_delay;

/* Set the custom message header */
message.addHeader(F("Message-ID: user1@gmail.com"));

/* The attachment data item */
SMTP_Attachment att[2];
int attIndex = 0;

/** Set the inline image info e.g.

• file name, MIME type, file path, file storage type,
• transfer encoding and content encoding
  */
  att[attIndex].descr.filename = F("orange.png");
  att[attIndex].descr.mime = F("image/png");
  att[attIndex].file.path = F("/orange.png");

/** The file storage type e.g.

• esp_mail_file_storage_type_none,
• esp_mail_file_storage_type_flash, and
• esp_mail_file_storage_type_sd
  */
  att[attIndex].file.storage_type = esp_mail_file_storage_type_sd;

/* Need to be base64 transfer encoding for inline image */
att[attIndex].descr.transfer_encoding = Content_Transfer_Encoding::enc_base64;

/** The orange.png file is already base64 encoded file.

• Then set the content encoding to match the transfer encoding
• which no encoding was taken place prior to sending.
  */
  att[attIndex].descr.content_encoding = Content_Transfer_Encoding::enc_base64;

/* Add inline image to the message */
message.addInlineImage(att[attIndex]);

/** Set the attachment info e.g.

• file name, MIME type, file path, file storage type,
• transfer encoding and content encoding
  */

attIndex++;
att[attIndex].descr.filename = F("bin1.dat");
att[attIndex].descr.mime = F("application/octet-stream"); // binary data
att[attIndex].descr.description = F("This is binary data");
att[attIndex].file.path = F("/bin1.dat");
att[attIndex].file.storage_type = esp_mail_file_storage_type_sd;
att[attIndex].descr.transfer_encoding = Content_Transfer_Encoding::enc_base64;

/* Add attachment to the message */
message.addAttachment(att[attIndex]);

/* Connect to the server */
if (!smtp.connect(&config))
{
ESP_MAIL_PRINTF("Connection error, Status Code: %d, Error Code: %d, Reason: %s", smtp.statusCode(), smtp.errorCode(), smtp.errorReason().c_str());
return;
}

if (smtp.isAuthenticated())
Serial.println("\nSuccessfully logged in.");
else
Serial.println("\nConnected with no Auth.");

/* Start sending the Email and close the session */
if (!MailClient.sendMail(&smtp, &message, true))
ESP_MAIL_PRINTF("Error, Status Code: %d, Error Code: %d, Reason: %s", smtp.statusCode(), smtp.errorCode(), smtp.errorReason().c_str());

// to clear sending result log
// smtp.sendingResult.clear();

ESP_MAIL_PRINTF("Free Heap: %d\n", MailClient.getFreeHeap());
}

void loop()
{
}

/* Callback function to get the Email sending status /
void smtpCallback(SMTP_Status status)
{
/ Print the current status */
Serial.println(status.info());

/* Print the sending result */
if (status.success())
{
// ESP_MAIL_PRINTF used in the examples is for format printing via debug Serial port
// that works for all supported Arduino platform SDKs e.g. AVR, SAMD, ESP32 and ESP8266.
// In ESP8266 and ESP32, you can use Serial.printf directly.

Serial.println("----------------");
ESP_MAIL_PRINTF("Message sent success: %d\n", status.completedCount());
ESP_MAIL_PRINTF("Message sent failed: %d\n", status.failedCount());
Serial.println("----------------\n");

for (size_t i = 0; i < smtp.sendingResult.size(); i++)
{
  /* Get the result item */
  SMTP_Result result = smtp.sendingResult.getItem(i);

  // In case, ESP32, ESP8266 and SAMD device, the timestamp get from result.timestamp should be valid if
  // your device time was synched with NTP server.
  // Other devices may show invalid timestamp as the device time was not set i.e. it will show Jan 1, 1970.
  // You can call smtp.setSystemTime(xxx) to set device time manually. Where xxx is timestamp (seconds since Jan 1, 1970)

  ESP_MAIL_PRINTF("Message No: %d\n", i + 1);
  ESP_MAIL_PRINTF("Status: %s\n", result.completed ? "success" : "failed");
  ESP_MAIL_PRINTF("Date/Time: %s\n", MailClient.Time.getDateTimeString(result.timestamp, "%B %d, %Y %H:%M:%S").c_str());
  ESP_MAIL_PRINTF("Recipient: %s\n", result.recipients.c_str());
  ESP_MAIL_PRINTF("Subject: %s\n", result.subject.c_str());
}
Serial.println("----------------\n");

// You need to clear sending result as the memory usage will grow up.
smtp.sendingResult.clear();

}
}

THIS IS THE DEBUG FROM THE ABOVE PROGRAM

[12:51:26:994] ets Jun 8 2016 00:22:57␍␊
[12:51:26:994] ␍␊
[12:51:26:994] rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)␍␊
[12:51:26:994] configsip: 0, SPIWP:0xee␍␊
[12:51:26:994] clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00␍␊
[12:51:26:994] mode:DIO, clock div:1␍␊
[12:51:26:994] load:0x3fff0030,len:1184␍␊
[12:51:26:994] load:0x40078000,len:13220␍␊
[12:51:27:000] ho 0 tail 12 room 4␍␊
[12:51:27:000] load:0x40080400,len:3028␍␊
[12:51:27:000] entry 0x400805e4␍␊
[12:51:27:414] ␍␊
[12:51:27:486] ␍␊
[12:51:27:486] Brownout detector was triggered␍␊
[12:51:27:486] ␍␊
[12:51:27:509] ets Jun 8 2016 00:22:57␍␊
[12:51:27:509] ␍␊
[12:51:27:509] rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)␍␊
[12:51:27:509] configsip: 0, SPIWP:0xee␍␊
[12:51:27:509] clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00␍␊
[12:51:27:509] mode:DIO, clock div:1␍␊
[12:51:27:509] load:0x3fff0030,len:1184␍␊
[12:51:27:509] load:0x40078000,len:13220␍␊
[12:51:27:516] ho 0 tail 12 room 4␍␊
[12:51:27:516] load:0x40080400,len:3028␍␊
[12:51:27:516] entry 0x400805e4␍␊
[12:51:27:929] ␍␊
[12:51:28:052] Connecting to Wi-Fi.␍␊
[12:51:28:355] Connected with IP: 192.168.85.134␍␊
[12:51:28:355] ␍␊
[12:51:28:355] ␊
[12:51:28:355] Mounting SD Card... success␊
[12:51:28:367] ␍␊
[12:51:28:367] Preparing SD file attachments...␍␊
[12:51:28:430] #### Connecting to SMTP server...␍␊
[12:51:28:430] > C: ESP Mail Client v3.2.0␍␊
[12:51:28:430] > C: Reading time from NTP server␍␊
[12:51:32:425] > C: connecting to SMTP server␍␊
[12:51:32:425] > C: Host > linux83.papaki.gr␍␊
[12:51:32:425] > C: Port > 465␍␊
[12:51:32:688] ␍␊
[12:51:32:688] > C: SSL/TLS negotiation␍␊
[12:51:32:688] > C: seeding the random number generator␍␊
[12:51:32:688] > C: setting up the SSL/TLS structure␍␊
[12:51:32:688] ! W: Skipping SSL Verification. INSECURE!␍␊
[12:51:32:688] > C: setting hostname for TLS session␍␊
[12:51:32:688] > C: perform the SSL/TLS handshake␍␊
[12:51:34:304] > C: verifying peer X.509 certificate␍␊
[12:51:34:304] ␍␊
[12:51:34:304] #### SMTP server connected␍␊
[12:51:34:304] > C: SMTP server connected, wait for greeting...␍␊
[12:51:34:716] < S: 220 server.linux83.papaki.gr ESMTP Postfix␍␊
[12:51:34:716] ␍␊
[12:51:34:716] #### Sending greeting response...␍␊
[12:51:34:716] > C: send SMTP command, EHLO␍␊
[12:51:35:124] < S: 250-server.linux83.papaki.gr␍␊
[12:51:35:124] < S: 250-PIPELINING␍␊
[12:51:35:124] < S: 250-SIZE 41943040␍␊
[12:51:35:124] < S: 250-ETRN␍␊
[12:51:35:148] < S: 250-AUTH DIGEST-MD5 CRAM-MD5 PLAIN LOGIN␍␊
[12:51:35:148] < S: 250-ENHANCEDSTATUSCODES␍␊
[12:51:35:148] < S: 250-8BITMIME␍␊
[12:51:35:148] < S: 250-DSN␍␊
[12:51:35:148] < S: 250 CHUNKING␍␊
[12:51:35:148] ␍␊
[12:51:35:148] #### Logging in...␍␊
[12:51:35:148] > C: send SMTP command, AUTH PLAIN␍␊
[12:51:35:148] > C: vorrias@pan-gaea.gr␍␊
[12:51:35:148] > C: **************␍␊
[12:51:35:540] < S: 235 2.7.0 Authentication successful␍␊
[12:51:35:540] ␊
[12:51:35:540] Successfully logged in.␍␊
[12:51:35:540] ␍␊
[12:51:35:540] #### Sending Email...␍␊
[12:51:35:540] > C: send Email␍␊
[12:51:35:540] ␍␊
[12:51:35:540] #### Sending message header...␍␊
[12:51:35:540] > C: send message header␍␊
[12:51:35:935] < S: 250 2.1.0 Ok␍␊
[12:51:36:419] < S: 250 2.1.5 Ok␍␊
[12:51:36:419] ␍␊
[12:51:36:419] #### Sending message body...␍␊
[12:51:36:419] > C: send message body␍␊
[12:52:06:421] > C: cleaning SSL connection␍␊
[12:52:06:443] #### Error, session timed out␍␊
[12:52:06:443] ! E: session timed out␍␊
[12:52:06:443] ␍␊
[12:52:06:443] #### -------------------------␍␊
[12:52:06:443] #### Message sent success: 0␍␊
[12:52:06:443] #### Message sent failed: 1␍␊
[12:52:06:443] #### -------------------------␍␊
[12:52:06:443] #### Status: failed␍␊
[12:52:06:443] #### Date/Time: January 01, 1970 00:00:00␍␊
[12:52:06:443] #### Recipient: vorrias.argo@gmail.com␍␊
[12:52:06:473] #### Subject: Test sending Email with attachments and inline images from SD card and Flash␍␊
[12:52:06:473] Error, Status Code: 0, Error Code: -401, Reason: session timed outFree Heap: 209480␊

I do nor really know where "[12:52:06:443] #### Date/Time: January 01, 1970 00:00:00␍␊" comes from
Thanks for your grate support.
Please tell me how to buy you a beer

[mobizt]

As I already said, the library works normally.

The ESP,32 core 2.0.10 is only two days released which might contain bugs which I have to test but it is not related to your issue.

The problem is your board power supply.

12:44:22:671] Brownout detector was triggered

You should change your cable or power supply.

[mobizt]

After test, I can confirm that the library works fine in ESP32 Core v2.0.10.

This is the message from the callback function which indicates the sending process exits before the internal timestamp of sending time was set.

Date/Time: January 01, 1970 00:00:00

[mobizt]

When the supply voltage drops because of too weak power supply during WiFi and SD card consume more current to work, it affected mcu operation included timer, clock and WiFi may fail to work.

[M10CUBE]

HI @mobizt here we are.
1 - You are right concerning the boot problem. Looks that ESP32 core ver 2.10 is sensitive to voltage drop when WiFi initializing and needs more power. USB cable power only connection that used for development is not enough . Now using external power 2.10 works OK.
2 - since Date/Time: January 01, 1970 00:00:00 is coming from the callback routine this is not a problem I suppose. But I can correct it knowing what cause it
3 - I had a contact with the support of my hosting provider (papaki.com) and they assured me that since the connection is SSL there is no problem.
4 - You said that the library works and that is a fact.
5 - your test program is definitely writing the files before sending them. I check it and the files are there meaning that the SD works fine.

I am really confused and leave's me one last attempt. To both check the same program using a google account.
To be honest I confused a bit about how exactly make this happen. I made 2-step verification turned on in my account but that is valid for my mobile .I could not find and direction to make it valid for email. If you can help me on that I will jumps start.

This is my last chance since we have a common ground (same provider) to make the test.
If that is working for you and not for me I suppose I have to jump from my window.
Can we do that please?
as I said before I will buy you a beer tonight succeeded or not.
Vasilis

[mobizt]

The library supports authentication methods that supported by IMAP and SMTP servers e.g., PLAIN, LOGIN and XOAUTH2 through its extensions that advertised during server connection greeting.

Other authentication flows e.g. 2-step verification is not related to IMAP and SMTP standards, and it's not supported in this library.

[mobizt]

I'm not sure I can get all you wrote because it is unclear as I don't know your context.
You should describe your problem and what's you need brief but complete.

[M10CUBE]

So I will make 2-step verification OFF. No problem. What next?

…

On Wed, Jul 19, 2023 at 8:29 PM Suwatchai K. ***@***.***> wrote: The library supports authentication methods that supported by IMAP and SMTP servers e.g., PLAIN, LOGIN and XOAUTH2 through its extensions that advertised during server connection greeting. Other authentication flows e.g. 2-step verification is not related to IMAP and SMTP standards, and it's not supported in this library. — Reply to this email directly, view it on GitHub <#276 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ADK6RSRRRMWCN3SZLLSAAJDXRAKN7ANCNFSM6AAAAAA2PEVMBE> . You are receiving this because you authored the thread.Message ID: ***@***.***>

-- Vasilis Vorrias R&D Electronics and Automation email: ***@***.*** linkedin.com/in/vasilis-vorrias-586805176 <https://www.linkedin.com/in/vasilis-vorrias-586805176> M10CUBE project: https://gitlab.com/m10cube/m10

[mobizt]

Next what? Please read my previous post and follow,

[mobizt]

Instead of asking the new topic other than you have created, you should post in the new discussion.

[M10CUBE]

@mobizt sorry is the differences in expressing the language.
My question "what next" was referring if you can help me to make this work after I make 2-step verification off. I did not know what to do next.
Anyway problem solved and I am very happy. Emails are coming with attached files.
I kept 2-step verification ON but following the directions I got an App passwords used for mail from other gear,
Having said that the problem is with my provider. I see how I can solve that, At the moment I am fine with Google.
Please tell me how I can buy you a coffee or a beer. PayPal?

Thank you
Vasilis

[mobizt]

If you mean performing 2FA, it is impossible to bring 2FA authentication flows to the embedded devices.

It required user consents that should be interface via UX/UI and required installed required SDK to work and the embedded system is not support.

The alternative Sign-in with Google is not support in embedded device too.

You can enable 2FA in Gmail and use app password as usual.

If you concern the security issue of using user and passwords, you can use OAuth2.0 bearer or access token like this example.

You can get access token from other apps to log in.

Or get the refresh token from other apps once and sending the token refreshment to googleapis.com to get new access token forever.

[M10CUBE]

Yes reading your read-me file I found how to use "app password as usual." using Google SMTP_HOST smtp.gmail.com PORT 587.
It is working perfect with Google mail server.
Now why this is not working with my provider #define SMTP_HOST "linux83.papaki.gr" PORT 465 is a mystery.
I asked the and they do not have a clue so I abandoned at the moment the idea connecting with them in favor of Google.

I will look in more detail your notes on "security issue of using user and passwords" and if I have any questions I will come back.
Now I have to finalize my software.

Thanks again
Vasilis

PS. Please tell me how to buy you a coffee.