Hi all,
the other day I was adding a domain to a backup SIMS mail server. The DNS
records for the domain's mailservers are:
domain1.com. 0S IN MX 10 mail.domain1.com.
domain1.com. 0S IN MX 20 mail2.domain1.com.
domain1.com. 0S IN MX 30 mail3.domain1.com.
I keep mail3 on a completely separate network located on the other side of
the country. Normally my router table for a domain's secondary has just one
line:
domain1.com = domain1.com.smtp
For some reason, no doubt the full moon plus a cut and paste I used in two
lines:
domain1.com = domain1.com.smtp
*.domain1.com = *.domain1.com.smtp
As chance and network problems would have (darn the Northpoint going
offline, PacBell DSL just isn't as stable) for a time only mail3 was
online. Today I received a helpful automated warning from a mailing list
showing a mail loop:
Received: from mail3.domain1.com ([65.105.116.89] verified) by
mail3.domain1.com (Stalker SMTP Server 1.8b5) with ESMTP id S.0000006564
for <[EMAIL PROTECTED]>; Sun, 15 Apr 2001 02:31:13 -0500
Received: from mail3.domain1.com ([65.105.116.89] verified) by
mail3.domain1.com (Stalker SMTP Server 1.8b5) with ESMTP id S.0000006566
for <[EMAIL PROTECTED]>; Sun, 15 Apr 2001 02:31:15 -0500
Received: from mail3.domain1.com ([65.105.116.89] verified) by
mail3.domain1.com (Stalker SMTP Server 1.8b5) with ESMTP id S.0000006568
for <[EMAIL PROTECTED]>; Sun, 15 Apr 2001 02:31:17 -0500
Received: from mail3.domain1.com ([65.105.116.89] verified) by
mail3.domain1.com (Stalker SMTP Server 1.8b5) with ESMTP id S.0000006570
for <[EMAIL PROTECTED]>; Sun, 15 Apr 2001 02:31:19 -0500
Can someone help me understand why that looped. When the outside world
couldn't find mail.domain1.com and mail2.domain1.com, it sent messages to
mail3.domain1.com. So why didn't mail3.domain1.com just accept the email,
follow the first router line and hold the messages until mail.domain1.com
came back online? Why would the second router line have been followed at
all? Presumable that is what happened so it began routing messages to itself.
Thanks for the help.
Joe
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