Frequent slow email delivery from our Red Hat Linux SMTP relay

I have been alerted to a situation where we have frequent (although it appears inconsistent) slow delivery of emails from a Red Hat Linux SMTP relay.  The emails are being delivered, but it appears to be a fairly frequent situations of slow delivery.  I want to find out if the problem is on our end (etc.), and to understand the problem generally.  This is a direct and simple SMTP relay used only for our IP subnets.   We use Sendmail.  Where and what can I look at on our Red Hat 5 system to see some evidence or information on this (possible) problem?  I want to know the logs to look at, and also what to look for in the logs.
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Sudeep SharmaTechnical DesignerCommented:
Look into the logs for the sendmail and search for the sender ID or the recipient ID for which email has been delayed.

You would get the Message ID from those Logs.
Then search for the Message ID which would let you know when the server got this message.
When it tried to connect to the remote server.
Which would tell you if the problem is at your end of the remote end.

Sendmail Logs:

If you would need to enabled the more verbose logging you could do it with the help of article below:


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raconeAuthor Commented:
Thanks.  A mx service at that domain was failing resulting in the delays.  Thanks for your help!
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