Issue Mail sender question -

[johdua]

Server operating system version

Debian 6.1.112-1

Plesk version and microupdate number

18.0.69 Update #4

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 a@xxx.com (me - the sender), b@xxx.com (recipient), c@xxx.com.
Using Thunderbird I can send email to b@xxx.com using my account (a@xxx.com) but put c@xxx.com in sender field, such email is received by b@xxx.com and looks like it was sent by c@xxx.com.
Can such behaviour be blocked in Plesk?

 

[johdua]

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?

 

[Sebahat.hadzhi]

Hello, @johdua . The reject policy can cause issues with Plesk notifications as per the disclaimer in the article (due to external SMTP server), hence, it is not set by default. As for your other question, editing the raw Postfix config via GUI, is not something common and it holds security risks, it is overly complicated to implement and maintain due to changes, and frankly, if the user has the knowledge on how to properly configure Postfix, they will likely be able to comfortably work over the command line.