UnicodeDecodeError

[aleohl]

Hello,

During receive of an email I got this error message 'utf-8' codec can't decode byte 0xf6 in position 499: invalid start byte.
I do think it was caused by åäö in the subject or body but not sure yet. Will try to reproduce and check what I can do in the code.

Thanks.

[geek-at]

I too have seen this error but was never able to reproduce it. Please tell me when you can reproduce it 😁

[aleohl]

I have the same issue, can't seem to find a way to reproduce it. Strange stuff

[DasDunkel]

I have managed to reproduce this error by using ö in the recipient address

Using it within the subject/body does not seem to cause the error

I'm using version 1.4.4

[sebastianflint]

I have the same error. Happens when sending mail from Outlook Client and inserting characters like "ö,ä"

[sebastianflint]

Still the same error with the newest 1.4.5 version.

Remote Server returned '554 5.0.0 <[45.9.60.49] #5.0.0 smtp; 5.3.0 - Other mail system problem 500-"Error: (UnicodeDecodeError) 'utf-8' codec can't decode byte 0xe4 in position 0: invalid continuation byte" (delivery attempts: 0)>'

[Pay1337]

I solved the problem by using "latin1" instead of "utf8" in mailserver3.py.

[geek-at]

Thanks for telling us this @Pay1337

I wonder though if this means it would crash, receiving UTF8 encoded email 🧐

[realalexandergeorgiev]

2024-11-05 10:27:27,836 - __main__ - DEBUG - Receiving message from: ('193.169.180.112', 40718) (Plaintext)
2024-11-05 10:27:27,836 - __main__ - DEBUG - Message addressed from: return@service.rmvmail.de
2024-11-05 10:27:27,836 - __main__ - DEBUG - Message addressed to: ['foo@foo.com']
('193.169.180.112', 40718) SMTP session exception
Traceback (most recent call last):
  File "/usr/lib/python3.11/site-packages/aiosmtpd/smtp.py", line 756, in _handle_client
    await method(arg)
  File "/usr/lib/python3.11/site-packages/aiosmtpd/smtp.py", line 1519, in smtp_DATA
    status = await self._call_handler_hook('DATA')
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/aiosmtpd/smtp.py", line 473, in _call_handler_hook
    status = await hook(self, self.session, self.envelope, *args)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/var/www/opentrashmail/python/mailserver3.py", line 74, in handle_DATA
    plaintext += part.get_payload(decode=True).decode('utf-8')
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xfc in position 249: invalid start byte

If you register at https://www.rmv.de/ you can reproduce it.

Cant retry, seems like there is a rate limit. If someone wants to try:
(vi /var/www/opentrashmail/python/mailserver3.py)

try:
    plaintext += part.get_payload(decode=True).decode('utf-8')
except UnicodeDecodeError:
    plaintext += part.get_payload(decode=True).decode('latin1')
except Exception as e:
        print(f"Error decoding payload: {e}")

fixed in fork, works for latin1:
realalexandergeorgiev@9aeae95

[geek-at]

Oh nice, sounds like a good solution until the root cause is fixed. Can you do a pull request?