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Date: Sat, 25 Feb 2012 10:41:58 +0000
From: Paul Macdonald <paul@ifdnrg.com>
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To: "Bender, Chris" <chris_bender@cellularatsea.com>
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On 24/02/2012 21:52, Bender, Chris wrote:
> Hi, I am responsible for a system I know little about.
>
> Sendmail all of a sudden stopped working...the sendmial is supposed to
> send to another machine.

Check /var/log/maillog on both boxes,

you should see a log message on the origin machine and the onward 
machine of the form

(I've replaced actual names with CAPS)

Feb 25 10:37:32 SERVER1 sm-mta[74139]: q1OIevSE033413-*MSGID*: 
to=<info@DOMAIN.com>, delay=15:56:34, xdelay=00:01:15, mailer=esmtp, 
pri=2919788, relay=SOME.RELAY. [X.X.86.167], dsn=4.0.0, stat=Deferred: 
Operation timed out with [SERVER]

What does the Stat say on the first box, if its anything other than Sent 
Ok, then it'll say why. ( deferred, refused etc).

Check the logs on the 2nd server for the same message.

Post extracts from both boxes if you need further help

good luck

Paul.
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