On 10/14/26 12:13 PM, Puchalski, Chris via Mailman-Users wrote:
I have an older version of mailman that cannot be upgraded due to a number of 
reasons and recently it appears that messages sent to the hosted lists seem to 
take a very large time once in the server. I can see the messages deliver to 
postfix and almost an hour later (maybe more) the messages leave the service to 
the list members.

Once Mailman delivers to the outgoing MTA (Postfix), it has no further involvement. This is a Postfix issue. Are the messages in Postfix deferred queue? What does Postfix `mailq` say about them?

--
Mark Sapiro <[email protected]>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan
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