SMTP Driver Read Timeout Error


  • Used Zammad version: 3.3.x
  • Used Zammad installation source: Package
  • Operating system: Ubuntu 18.04 TLS server x&$

Expected behavior:

  • Sending emails via the mail channel is not always functional

Actual behavior:

  • Hi all,
    in on the installation for my company we are having problems sending emails.
    Sometimes Zammad encounters a Read Timeout error on the SMTP driver. Testing from the console the connection via ping or via telnet the result on the connection status is always positive.
    Is there any problem in handling exceptions in case of connection errors?

I attach the screenshots about the problem


I recommend using Local MTA with configuration of postfix - works like a charm

We see these kind of issues within hosted environments as well.
This however is quite a rare issue and in my opinion mostly is because of temporary the connection to take unexpectly long.

If this doesn’t cause mails not being sent out, I personally would say it’s okay.
Usually this appears after no longer than 5 minutes.

Zammad retries sending mails up to 4 times.
You may also want to check the mail servers logfile if possible.

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