[CentOS] sendmail Deferred mail - reason unknown

Scott Silva ssilva at sgvwater.com
Mon Dec 15 21:57:17 UTC 2008

on 12-15-2008 8:15 AM Sean Carolan spake the following:
> I'm a bit baffled by this problem.  Maybe there's a sendmail guru out
> there who can help me out here.  We have some end-users who need to
> receive system-generated mail that originates from a java-based
> application on our network.  The java app sends the mail through our
> sendmail cluster, which then sends the email on to the end-user over the
> Internet.  The size of the emails can range from a few kb up through
> around 2Mb in size. 
> The mail logs show that these emails are typically delayed for up to 24
> hours, sometimes longer.  It appears that several attempts to deliver
> the email are made, with each unsuccessful one showing "Deferred" status
> in the maillog.  After several hours of failed attempts the mail finally
> goes through successfully.  Here is a typical entry (customer name
> redacted):
> exmx1 : Dec 14 05:28:39 exmx1 sendmail[31574]: mBDIYhEa031574:
> to=<customer at example.com
> <mailto:customer at example.com>>,
> delay=00:00:00, xde
> lay=00:00:00, mailer=esmtp, pri=41874, relay=mail.example.com
> <http://mail.example.com>., dsn=4.0.0, stat=Deferred
> Unfortunately there is no reason given for the "Deferred" status such as
> "Server unavailable", etc. 
> Do you have any ideas how I can begin to troubleshoot this?
Does the machine have good dns resolution?
Are the clocks synced to a proper time.. (IE... local time is +8 but the clock
is actually -8). GMT is OK as long as the box knows that is its timezone.

MailScanner is like deodorant...
You hope everybody uses it, and
you notice quickly if they don't!!!!

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