I’ve got a strange question, that hopefully someone can point me in the right 
direction.

We’ve got a Mailman 2.1.26 server, with Postfix 3.3.0 as the MTA which has been 
running for several years; however, recently we’ve been noticing random cases 
where posts sent to a list (it can be any list hosted by the server), are 
received by Postfix, handed off to Mailman, appear in the list’s archives, but 
are never sent back out to the list members.

In an effort to troubleshot this we have a scheduled task on another sever that 
sends an hourly “heartbeat” message to a specific list. We’re seeing the 
following random patterns:

  *   Some days every hourly message arrives to the list, is archived, and is 
successfully sent to list members.
  *   Some days several of the hourly messages arrives to the list, is 
archived, and is successfully sent to list members, only to be followed by some 
(random 1-3) hourly messages that are archived but not sent out, then delivery 
resumes as expected.

There is no consistency with time of day regarding to which messages are not 
being received by list members. Checking both the Postfix mail.log, and Mailman 
post log files we notice that the messages which are received by the list 
members is record within both files; however, the missing messages are only 
recorded within the Postfix log file, the matching entry in the Mailman post 
log is absent.

Digging through this list’s archives I found a similar 
post<https://mail.python.org/archives/list/mailman-users@python.org/thread/3FACVS3DWQRG7IWO7NL6VRXYNLKYP7XT/#3FACVS3DWQRG7IWO7NL6VRXYNLKYP7XT>
 from years ago; however, no resolution appeared to have been identified. 
Working through the “4.78 Troubleshooting: No mail going out to lists 
members<https://wiki.list.org/DOC/4.78%20Troubleshooting-%20No%20mail%20going%20out%20to%20lists%20members>”
 doesn’t appear to have identify any likely causes/fixes.

Any suggestions on how to track down this gremlin?

Have a great day,
Chris

--
Chris Axtell
Enterprise Applications Engineer
Information Technology Services
University of Alaska Anchorage
3190 Alumni Drive, SSB 120
Anchorage, Ak 99508
email: chris.axt...@alaska.edu<mailto:chris.axt...@alaska.edu>
Teams: 
cbaxt...@alaska.edu<https://teams.microsoft.com/l/chat/0/0?users=cbaxt...@alaska.edu>

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