< S: 530 Authentication required

[andreaskuhl]

After changing the library from version 2.7.11 to 3.1.0 , I get the following error with the example SMTP Send_Text:

### Connecting to SMTP server...
> C: ESP Mail Client v3.1.0
> C: wait for NTP server time synching
> C: connecting to SMTP server
> C: Host > smtp.1und1.de
> C: Port > 465

> C: SSL/TLS negotiation

#### SMTP server connected
> C: SMTP server connected, wait for greeting...
< S: 220 kundenserver.de (mreue108) Nemesis ESMTP Service ready

#### Sending greeting response...
> C: send SMTP command, HELO
< S: 250-kundenserver.de Hello mydomain.net [79.240.168.153]
< S: 250-8BITMIME
< S: 250-AUTH LOGIN PLAIN
< S: 250 SIZE 140000000
Connected with no Auth.

#### Sending Email...
> C: send Email

#### Sending message header...
> C: send message header
< S: 530 Authentication required
#### Error, send header failed
! E: send header failed

#### -------------------------
#### Message sent success: 0
#### Message sent failed: 1
#### -------------------------
#### Status: failed

SMTP_HOST = "smtp.1und1.de"
SMTP_PORT = esp_mail_smtp_port_465
AUTHOR_EMAIL & AUTHOR_PASSWORD are set correct

How can I enable the extra authentication for the SMTP server?
... as I said with the old library 2.7.11 this works without further code changes.

[Plashu]

I am having the same issue for this update, SMTP no longer attempts to authenticate and no error is triggered until trying to send the email header.

C: ESP Mail Client v3.1.0
C: connecting to SMTP server
C: Host > smtp.gmail.com
C: Port > 465

C: SSL/TLS negotiation
C: seeding the random number generator
C: setting up the SSL/TLS structure
C: loading CA cert
C: setting hostname for TLS session
C: perform the SSL/TLS handshake
C: verifying peer X.509 certificate

C: SMTP server connected, wait for greeting...
< S: 220 smtp.gmail.com ESMTP x18-[REDACTED].52 - gsmtp

C: send SMTP command, HELO
< S: 250-smtp.gmail.com at your service, [REDACTED]
< S: 250-SIZE 35882577
< S: 250-8BITMIME
< S: 250-AUTH LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH
< S: 250-ENHANCEDSTATUSCODES
< S: 250-PIPELINING
< S: 250-CHUNKING
< S: 250 SMTPUTF8

C: send Email

C: send message header
< S: 530-5.7.0 Authentication Required. Learn more at
< S: 530 5.7.0 https://support.google.com/mail/?p=WantAuthError x18-[REDACTED].52 - gsmtp
! E: send header failed
C: cleaning SSL connection
Error sending email: send header failed

[Plashu]

I was able to fix mine by reverting changes in ESP_Mail_SMTP.h from commit# c6f7ca3

[mobizt]

I will check this and inform you soon.

[mobizt]

Now the library v3.1.1 is available, please update.

[andreaskuhl]

Looks like it works with version 3.1.1.
Great thanks!