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Old 9th November 2010, 03:45
archerjd archerjd is offline
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Default Reject forged/spoofed email addresses

Many people have been asking how to block forged MAIL FROM:<> email addresses.

Correct me if I wrong but it seems to me that Postfix:reject_unauthenticated_sender_login_mismatch could resolve this issue for all local addresses. If so I could see integrating this into ISPC3.

You can read up on it here.

It is my understanding that if used with smtpd_recipient_restrictions it will require you to be authenticated for any addresses located in $smtpd_sender_login_maps & that can be easily specified.

Here is another post with a similar dilemma.
http://howtoforge.com/forums/showthread.php?t=47918
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