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From: krenaut@jax.jaxnet.com (Karl Renaut)
Newsgroups: comp.unix.bsd.bsdi.misc
Subject: Sendmail relay host problems
Date: 3 Jun 1996 12:06:53 GMT
Organization: Southeast Network Services, Inc.
Lines: 67
Message-ID: <4oukgt$11a@jaxnet.jaxnet.com>
NNTP-Posting-Host: jax.jaxnet.com
X-Newsreader: TIN [version 1.2 PL2]
I am having a problem with my sendmail configuration, under light load
everything works fine, but when the mail server is overloaded and the
sending entity goes to the second or third MX preference... the mail gets
bounced due to a configuration error that indicates the the "mail loops
back to me, MX problem?"
Here is the MX records for my mail server:
mailhub IN MX 10 mailhub.southeast.net.
IN MX 50 www1.southeast.net.
IN MX 100 jaxnet.southeast.net.
IN MX 150 offsite.host.com.
There is nothing special about the sendmail.cf on hosts www1 or jaxnet
they are pretty much stock BSDI 2.1 delivered sendmail.cf files.
If I telnet to port 25 of either www1 or jaxnet and post an email by
hand, they get deliverd without errors to mailhub. I.E:
<<<<<<BEGIN MANUAL SMTP TEST SESSION>>>>>
telnet www1 25
Trying 204.215.9.20...
Connected to www1.southeast.net.
Escape character is '^]'.
220 www1.southeast.net ESMTP Sendmail ........
helo jax.southeast.net
250 www1.southeast.net Hello krenaut@jax.southeast.net [204.183.221.4],
pleased to meet you
mail from:<krenaut@southeast.net>
250 <krenaut@southeast.net>... Sender OK
rcpt to:<test1#southeast.net>
250 Recipient OK
data
354 Enter mail, end with "." on a line by itself
test data
.
250 IAA20737 Message accepted for delivery
quit
221 www1.southeast.net closing connection
Connection closed by foreign host.
<<<<<END MANUAL SMTP TEST SESSION>>>>>
The above E-Mail is delivered/relayed to mailhub.southeast.net with no
errors!
But, when my mailhub machine is overloaded and refuses SMTP connections
and the sending agent has to try to send the email to one of the lower
priority MX hosts, sometimes (not always) I get the mail config error:
"mail loops back to me, MX problem?" and the E-Mail bounces. This only
happens under extremely heavy load, like when I do mass mailings... it
seems to only happen when more than one of the lower priority MX hosts is
involved, but I'm not sure about that. I get the error messages from both
of the lower priority MX hosts (www1 and jaxnet).
What am I doing wrong? This stuff used to work under BSDI 1.1.
--
-----------------------------------------------------------------
Karl Renaut Voice: 904-350-1969
Southeast Network Services Data: 904-292-4567
P.O. Box 56946 email: krenaut@southeast.net
Jacksonville, FL 32241 http://jax.jaxnet.com
Making Internet Affordable / - \
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