[Mimedefang] Trying to find cause of tempfails

[Cormack, Ken]

Group,

This morning, I've been trying to diagnose a type of tempfail I'm repeatedly
seeing, when a particular party tries emailing to us.  The tempfail verbage
is non-descript, and doesn't match any strings I've got in my filter.
Perhaps one of you could help identify the reason these are tempfailing?

Just one such example looks like this (some address munging applied, to
protect the innocent)...

Mar  7 01:00:19 mail01 sendmail[31935]: j2760J2V031935:
from=<SELEX-FACS at MUNGEDSENDER.COM>, size=26614, class=0, nrcpts=1,
msgid=<02F117E1B24BA9F2 at munged.com>, proto=ESMTP, daemon=MTA,
relay=gbhub.mungeddomain.com [151.147.XXX.32]
Mar  7 01:00:21 mail01 sendmail[31935]: j2760J2V031935: Milter: data,
reject=451 4.3.2 Please try again later
Mar  7 01:00:21 mail01 sendmail[31935]: j2760J2V031935:
to=<cindyw at mungedrecip.com>, delay=00:00:02, pri=56614, stat=Please try
again later

As you can see, the log entries don't say much, and none of my rules (that
I'm aware of) send a "451 4.3.2" tempfail, specifically.

Anyone recognize this?

Ken