• Debian 11 is approaching its end-of-life (vendor EOL date - August 31, 2026). Plesk Obsidian 18.0.80 will be the last release to support it.
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Use og alternative smtp port

I'm not sure if this work for postfix, but give it a shot...

If you go to Server -> Mail server settings you can check the option "Enable message submission". This will make a new file in /etc/xinetd.d/ called submission_psa. This will enable TCP port 587 for SMTP connections. You can test this by telnetting to that port, and if you get response then you should be OK. Don't forget to check you firewall rule afterwords to make sure it allows TCP 587.
 
I renamed the submission.psa file that was there from qmail, and hit the "enable message submission: check box, but our server did not generate a new file that would work with postfix. Could someone post the contents of the file for postfix. Cent OS 5.5
Thanks
 
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