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The APS Catalog has been deprecated and removed from all Plesk Obsidian versions. Applications already installed from the APS Catalog will continue working. However, Plesk will no longer provide support for APS applications.
Please be aware: with the Plesk Obsidian 18.0.78 release, the support for the ngx_pagespeed.so module will be deprecated and removed from the sw-nginx package.
According my knowledge you can change it only by SSH # etc/postfix then in main.cf you can force some smtp behaviors. Backup this file first!!! By editing you can crash postfix very easy.
My story: I had the same issue on fresh Ubuntu+Plesk. I could not find the cause and finally get broke Postfix :)
My resolve path:
1. Tools&Settings -> Plesk -> Updates: Uninstall Postfix by installing Qmail, then install Postfix by uninstalling Qmail
2. Tools&Settings -> Mail -> Mail Server...