Dear all, I have a simple Postfix policy server, and got a problem to reject sender login mismatch (sender != sasl_username) with Outlook 2016: user is able to specify a From: address, it would be any address you want, and the From: address is not passed to policy server.
I can reproduce this issue with a simple Python program: *) construct mail message with forge sender address. e.g. 'From: <fo...@forge.com>' *) send email as normal/legal user "auth_u...@my-domain.com" with smtp auth. *) while sending email, specify the sender address as "auth_u...@my-domain.com". *) When user received the email, his MUA shows the address in 'From:' as sender. In this case: - address 'fo...@forge.com' is not available in policy server - attributes 'sender=' and 'sasl_username' are 'auth_u...@my-domain.com' So the question is, does Postfix parse the submitted mail message to get 'From:' address? How can i overcome this? Thanks for helping. :)
