Error sending email [SMTP]

[mario26]

Hello,

I configured the email service in Synapse but the emails are not sent, here is the return:

synapse       | 2020-04-01 10:55:53,106 - synapse.access.http.8008 - 302 - INFO - OPTIONS-9 - 37.173.176.107 - 8008 - {None} Processed request: 0.000sec/0.000sec (0.000sec, 0.000sec) (0.000sec/0.000sec/0) 2B 200 "OPTIONS /_matrix/client/r0/register/email/requestToken HTTP/1.0" "Mozilla/5.0 (X11; Linux x86_64; rv:74.0) Gecko/20100101 Firefox/74.0" [0 dbevts]
synapse       | 2020-04-01 10:55:53,182 - synapse.push.mailer - 315 - INFO - POST-10 - Sending email to xxxxxxx@xxxxxxxx.com
synapse       | 2020-04-01 10:55:53,474 - twisted - 192 - INFO -  - SMTP Client retrying server. Retry: 5
synapse       | 2020-04-01 10:55:53,722 - twisted - 192 - INFO -  - SMTP Client retrying server. Retry: 4
synapse       | 2020-04-01 10:55:53,966 - twisted - 192 - INFO -  - SMTP Client retrying server. Retry: 3
synapse       | 2020-04-01 10:55:54,190 - twisted - 192 - INFO -  - SMTP Client retrying server. Retry: 2
synapse       | 2020-04-01 10:55:54,433 - twisted - 192 - INFO -  - SMTP Client retrying server. Retry: 1
synapse       | 2020-04-01 10:55:54,673 - synapse.handlers.identity - 359 - ERROR - POST-10 - Error sending threepid validation email to xxxxxxx@xxxxxxxx.com
synapse       | Traceback (most recent call last):
synapse       |   File "/usr/local/lib/python3.7/site-packages/synapse/handlers/identity.py", line 356, in send_threepid_validation
synapse       |     yield send_email_func(email_address, token, client_secret, session_id)
synapse       | twisted.mail._except.SMTPConnectError: Unable to connect to server.
synapse       | 2020-04-01 10:55:54,674 - synapse.http.server - 81 - INFO - POST-10 - <XForwardedForRequest at 0x7fb6a34b1ad0 method='POST' uri='/_matrix/client/r0/register/email/requestToken' clientproto='HTTP/1.0' site=8008> SynapseError: 500 - An error was encountered when sending the email
synapse       | 2020-04-01 10:55:54,675 - synapse.access.http.8008 - 302 - INFO - POST-10 - 37.173.176.107 - 8008 - {None} Processed request: 1.501sec/0.001sec (0.016sec, 0.000sec) (0.002sec/0.001sec/2) 81B 500 "POST /_matrix/client/r0/register/email/requestToken HTTP/1.0" "Mozilla/5.0 (X11; Linux x86_64; rv:74.0) Gecko/20100101 Firefox/74.0" [0 dbevts]

I think the server SMTP does not accept the Synapse connection for sending emails, i think of a TLS error...

Here's what my conf looks like:

email:
  # The hostname of the outgoing SMTP server to use. Defaults to 'localhost'.
  #
   smtp_host: mail.xxxxxxxx.com

  # The port on the mail server for outgoing SMTP. Defaults to 25.
  #
  #smtp_port: 587

  # Username/password for authentication to the SMTP server. By default, no
  # authentication is attempted.
  #
   smtp_user: "myuser@xxxxxxxx.com"
   smtp_pass: "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

   require_transport_security: true

I have already tried different ways of configuration, nothing works.

Can you help me ?

[clokep]

This sounds like it might be a duplicate of #6211.

[richvdh]

assuming this is a duplicate

[Neustradamus]

Good news, the Twisted 21.2.0 stable version is out!

• https://mail.python.org/archives/list/python-announce-list@python.org/thread/HHAY6XA5YRAYBA7IUL5UELX74H7W2X3V/
• https://github.com/twisted/twisted/releases/tag/twisted-21.2.0

Thanks a lot to @mmilata for this very important contribution and @rodrigc, @glyph and @twisted (Twisted Matrix Labs) team.

• [9740] ESMTPSender: dont't force TLSv1.0 by default twisted/twisted#1225