No mail send with a Mailjet config on VPS

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A user, Jonathanb, reports that emails are not being sent from a Discourse instance configured with Mailjet on an OVH VPS. Despite successful SMTP authentication via telnet, no emails are sent. The issue is resolved when Hector suggests disabling TLS in the configuration, which Jonathanb confirms fixes the problem. The user also checks the Mailjet dashboard and verifies SMTP settings in the Discourse admin panel.

1

Hi.

First of all. Thanks very much for this great product :smile:

I try to configure a new Discourse instance on my OVH VPS in order to send mail with mailjet (or mandrill) but no mail send. I tried many things without success.

Any idea? Where can I find logs?

My config below:

env:
  ## TODO: List of comma delimited emails that will be made admin and developer
  ## on initial signup example 'user1@example.com,user2@example.com'
  DISCOURSE_DEVELOPER_EMAILS: "bmxperience@gmail.com"

  ## TODO: The domain name this Discourse instance will respond to
  DISCOURSE_HOSTNAME: "discourse.bmxperience.com"

  ## TODO: The mailserver this Discourse instance will use
  DISCOURSE_SMTP_ADDRESS: "in-v3.mailjet.com" # (mandatory)
  DISCOURSE_SMTP_PORT: 587 # (optional)
  DISCOURSE_SMTP_USER_NAME: "my-mailjet-api-key" # (optional)
  DISCOURSE_SMTP_PASSWORD: "my-mailjet-secret-key" # (optional, WARNING the char '#' in pw can cause problems!)
  #DISCOURSE_SMTP_ENABLE_START_TLS: true # (optional, default true)
.
.
.
run:
  - exec: echo "Beginning of custom commands"

  ## If you want to set the 'From' email address for your first registration, uncomment and change:
  - exec: rails r "SiteSetting.notification_email='forum@bmxperience.com'"
  ## After getting the first signup email, re-comment the line. It only needs to run once.

I successfully send mail using telnet:

root@vps197853:~# telnet in-v3.mailjet.com 587
Trying 46.105.54.204...
Connected to in.mailjet.com.
Escape character is '^]'.
220 leela-8.mailjet.com ESMTP Mailjet
auth login
334 VXNlcm5hbWU6
Mqsdfqsdfqsdfqsdfsdf= #(base64 of mailjet api key)
334 UGFzc3dvcmQ6
Msdsdfsdfsdfsdfsdfdsffdsdfsdfsdf= #(base64 of mailjet secret key)
235 2.7.0 Authentication successful
MAIL FROM:forum@bmxperience.com
250 2.1.0 Ok
RCPT TO:bmxperience@gmail.com
250 2.1.5 Ok
data
354 End data with <CR><LF>.<CR><LF>
To:bmxperience@gmail.com
From:forum@bmxperience.com
Subject: Test Mailjet

Yeah!
.
250 2.0.0 Ok: queued as 823102E400AF
quit
221 2.0.0 Bye

And the last command line after the ./launcher start app

+ /usr/bin/docker run -d --restart=always -e LANG=en_US.UTF-8 -e RAILS_ENV=production -e UNICORN_WORKERS=3 -e UNICORN_SIDEKIQS=1 -e RUBY_GC_MALLOC_LIMIT=40000000 -e RUBY_HEAP_MIN_SLOTS=800000 -e DISCOURSE_DB_SOCKET=/var/run/postgresql -e DISCOURSE_DB_HOST= -e DISCOURSE_DB_PORT= -e HOME=/root -e DISCOURSE_DEVELOPER_EMAILS=bmxperience@gmail.com -e DISCOURSE_HOSTNAME=discourse.bmxperience.com -e DISCOURSE_SMTP_ADDRESS=in-v3.mailjet.com -e DISCOURSE_SMTP_PORT=587 -e DISCOURSE_SMTP_USER_NAME=my-mailjet-api-key -e DISCOURSE_SMTP_PASSWORD=my-mailjet-secret-key -h vps221296.ovh.net-app -e DOCKER_HOST_IP=172.17.0.1 --name app -t -p 80:80 -p 2222:22 -v /var/discourse/shared/standalone:/shared -v /var/discourse/shared/standalone/log/var-log:/var/log local_discourse/app /sbin/boot
dbf7ef50186eaf105208e9d5984f706f0d2c0ea5c23fbe22ef787f624f8f2547
2

I’m not to familiar with mail jet as I use Send Grid with my discourse instance but that shouldn’t matter.

  • if you force an email to be sent from discourse (sign up a test user etc) and when you check on yor mail jet dashboard, do any outbound emails show. If so are they being “dropped” ?

  • have you verified your SMTP settings on yourdiscourse/admin/email ?

3

Did you try disabling TLS in the config? That would be a difference between your settings and the telnet test.

4

Good point! I changed this line:

DISCOURSE_SMTP_ENABLE_START_TLS: false # (optional, default true)

and… it works!

Thanks very much.