Hi List

Postfix 3.4.13 in use.

I'm observing a probably milter caused issue and wanted to know if
there are ways to log the invocations of milter commands from postfix
to the milter.

As smtpd milter we use:

MIMEDefang (using spamassassin / clamav)
milter-greylist
opendmarc

Every now and then, an email to multiple recipients is constantly being
rejected by Postfix with:

milter-reject: RCPT from (sending server) 451 4.7.1 Service unavailable - try 
again later;

With MIMEDefang I do now log every invocation of filter_recipient()
which is invocated by the RCPT milter command.

Observation:

First handful of recipients show up in the MIMEDefang Log. Then there
is a 30 seconds gap, then Postfix fails all remaining recipients and
the complete email with 4.7.1
If one email triggers that issue, it is triggered every time, on all of
our 3 MX with identical milter config.

I start to suspect, that one of the other milter fails. Is there a way
to log the milter commands sent from postfix to each milter from withing
postfix to find out which milter is 'timing out' on RCPT?

Mit freundlichen Grüssen

-Benoît Panizzon-
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