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Discussed with PMs - unfortunately, right now we cannot suggest anything to restrict such behaviour. It cannot be done easily. This was added to a plan, but will be done not earlier than in next Plesk version. Such issue may occur in case spammer compromises existing mail account and starts...

This is default SMTP protocol behaviour. Indeed, this is probably can be changed on the server side, but requires research. I will have a meeting with our Project Managers on Monday to evaluate costs and possibility to implement this, I will update this thread with results then.

The behavior you described is expected. Postfix or any other mail server (qmail, MailEnable) by default allows authenticated users to change “from” header. You may suggest this feature for implementing on uservoice: https://plesk.uservoice.com/forums/184549-feature-suggestions

Together with Atomic we have fixed the issue. Please update Atomic ruleset using command "aum -u" command

Hi all, We published a KB article with workaround for this issue: http://kb.odin.com/en/126493 Problem has been reported to Plesk Service Team for deeper investigation and permanent resolution.