>What happens is, every time our SMTP (firewall) server is re-booted the
listserver sends out the last several MONTHS worth of messages to anyone
who it has ever had trouble sending to in the past ...

Dave:

By what means did you arrive at the conclusion that it is LISTSERV
generating the duplicates vs. a broken SMTP firewall configuration?

Show us a set of the distributed duplicate (just the) MESSAGE headers, if
the bodies are the same.

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