restricting acceptence of mail users except from local network
in [Postfix]
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From: Noel Jones on 24 Feb 2010 10:30 On 2/24/2010 12:47 AM, Ruben Safir wrote: >> >> Anyway to restrict the From: header to the local domain as well as the >> From<whitespace> header >> >> It seems that Majordomo will accept the mail if the From: is different >> than the From >> >> > From mrbrklyn(a)panix.com >> >> From: ruben(a)mrbrklyn.com >> >> I'd like to reject it at the mail server if either is spoofed and it is >> not originating from my local hosts on the internal network. >> > > > Actually, thing about this, that might not be a good idea and I doubt it > is even in the envelope. > > Ruben Right, rejecting From: headers that falsely claim to be from your domain is guaranteed to cause problems. Look at your posts to this mail list... There's no easy solution to forged From: headers, but SpamAssassin can be a big help by identifying the underlying spam payload. Also clamav antivirus with the Sanesecurity anti-spam/anti-phish addon signatures can catch a good amount of unwanted mail. Postfix can use clamav-milter to reject unwanted mail before it enters your system. -- Noel Jones |