> So, Postfix appears to be an open relay to the stupid mail-abuse.org > test, because the test does not confirm the relay when it receives its > message back, but right after it gives it away.
This is also the case for Exim, I believe, with a standard configuration (percent_hack_domains commented out): $ telnet mail.math-hat.com 25 Trying 216.254.75.142... Connected to zukerman-1.dsl.speakeasy.net. Escape character is '^]'. 220 zukerman-1.dsl.speakeasy.net ESMTP Exim 3.12 #1 Thu, 02 Nov 2000 06:53:53 -0500 HELO foo 250 zukerman-1.dsl.speakeasy.net Hello foo [x.x.x.x] MAIL FROM: <[EMAIL PROTECTED]> 250 <[EMAIL PROTECTED]> is syntactically correct RCPT TO: <[EMAIL PROTECTED]> 250 <[EMAIL PROTECTED]> is syntactically correct DATA 354 Enter message, ending with "." on a line by itself testing... . 250 OK id=13rIxD-0002aC-00 quit >From /var/log/exim/mainlog: 2000-11-02 06:54:50 13rIxD-0002aC-00 <= [EMAIL PROTECTED] H=(localhost) [x.x.x.x] P=smtp S=308 2000-11-02 06:54:50 13rIxD-0002aC-00 ** [EMAIL PROTECTED]: unknown local-part "foo%bar.com" in domain "math-hat.com" 2000-11-02 06:54:50 13rIxG-0002aI-00 <= <> R=13rIxD-0002aC-00 U=mail P=local S=1120 2000-11-02 06:54:50 13rIxD-0002aC-00 Error message sent to [EMAIL PROTECTED] 2000-11-02 06:54:50 13rIxD-0002aC-00 Completed -itai
