SMTP Mail Relay between the local host and remote computer exhibits the following behavior:
~$ telnet dslxxxxxxxx.com 25 Trying 72.167.97.127... Connected to dslxxxxxxxx.com. Escape character is '^]'. 220-ms.dslxxxxxxxx.com ESMTP Exim 4.69 #1 Wed, 21 Oct 2009 13:34:34 -0700 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail. helo mail.dyndns.com 250 ms.dslxxxxxxxx.com Hello xen.thisisnotatrueending.com [216.146.46.13] mail from:[email protected] 250 OK rcpt to:[email protected] 421 Unexpected failure, please try later rcpt to:[email protected] 421 Unexpected failure, please try later rcpt to:[email protected] 421 Unexpected failure, please try later rcpt to:fdfd 421 Unexpected failure, please try later rcpt to:421 Unexpected failure, please try later exit 421 Unexpected failure, please try later quit 221 ms.dslxxxxxxxx.com closing connection Connection closed by foreign host. For each of the above RCPT TO lines, your server should return a 500-level permanent failure error. For example: rcpt to:[email protected] 421 Unexpected failure, please try later should become: rcpt to:[email protected] 550 Relay denied Of course, your server should accept mail for itself: rcpt to:[email protected] 250 OK Similarly, and likely related to this behavior, the local server transmitting all of the mail it received (potentially forwarding) to itself via Outbound, using the sender's address as the From: address: 2009-10-21 18:00:38 1N0fUE-000HqZ-NG <= [email protected] H=ip-72-167-97-127.ip.secureserver.net (ms.dslxxxxxxxx.com) [72.167.97.127] P=esmtpsa X=TLSv1:AES256-SHA:256 A=login:uisiscom S=2688 [email protected] 2009-10-21 18:00:39 1N0fUE-000HqZ-NG => [email protected] R=dnslookup T=remote_smtp H=mx1.mailhop.org [216.146.33.1] 2009-10-21 18:00:39 1N0fUE-000HqZ-NG Completed 2009-10-21 18:00:59 1N0fUZ-000Hvz-6h <= [email protected] H=ip-72-167-97-127.ip.secureserver.net (ms.dslxxxxxxxx.com) [72.167.97.127] P=esmtpsa X=TLSv1:AES256-SHA:256 A=login:uisiscom S=4185 [email protected] 2009-10-21 18:00:59 1N0fUZ-000Hvz-6h no immediate delivery: more than 15 messages received in one connection 2009-10-21 18:07:23 1N0fal-000KwZ-IM <= [email protected] H=ip-72-167-97-127.ip.secureserver.net (ms.dslxxxxxxxx.com) [72.167.97.127] P=esmtpsa X=TLSv1:AES256-SHA:256 A=login:uisiscom S=6456 [email protected] 2009-10-21 18:07:24 1N0fal-000KwZ-IM => [email protected] R=dnslookup T=remote_smtp H=mx1.mailhop.org [216.146.33.3] 2009-10-21 18:07:24 1N0fal-000KwZ-IM Completed -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
