Error SSL with SMTP port 25 & 26

Technical assistance
1
  • Used Zammad version: 5.1.0
  • Used Zammad installation type: package
  • Operating system: debian 11

Expected behavior:

  • not to have the error and to be able to pass without ssl

Actual behavior:

Steps to reproduce the behavior:

  • the postfix server is not in the company network
3

This is not a Zammad problem, you should check the configuration of your mailserver and test the correct settings with a different client first. Maybe your mailserver doesn’t allow unencrypted SMTP.
Never heard of an STMP server using port 26

4

Modern email servers use port 587 for the secure submission of email for delivery. Maybe try this port?

5

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