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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...