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Ok, I found it: How to restrict mismatch of “From” header for emails and prevent outbound mail spoofing on Plesk for Linux server with Postfix? - Support Cases from Plesk Knowledge Base Does anyone know why is it not the default configuration and why is it not possible to configure this via GUI?

While solving strange issue with email delivery I found something that I am not sure is ok (or actually I am sure it is not). I have three email boxes on server, for example [email protected] (me - the sender), [email protected] (recipient), [email protected]. Using Thunderbird I can send email to [email protected] using my...