Hi Paul

Glad you got that sorted! I wonder why those filters were in there? Not really the kind of thing I'd expect Postfix to be doing out of the box!

Looks like you didn't send to the list (at least, I got my copy via personal mail, not the list). Replying for the benefit of Mailman-Users (nothing new to you here).

Sparks, Paul writes:

Postfix was filtering the headers. I was not familiar with this postfix functionality.

For others who might see this, the filter lines were in /etc/postfix/header_checks /^List-Unsubscribe:/ IGNORE /^List-Subscribe:/ IGNORE

...

How are you capturing mail at postfix?

For capturing the email at postifx I used the following to defer SMTP sending. postconf -e defer_transports=smtp; postfix reload

That swooshing sound is that concept returning to hover over my head.

# send the email to the server mailq # Use ID from mailq to examine the email using postcat postcat -vq C23D82B60024 # Re-enable SMTP sending postconf -e defer_transports=; postfix reload; postfix flush

That's potentially useful in a lot of situations!

Steve

-- GNU Mailman consultant (installation, migration, customization) Sirius Open Source https://www.siriusopensource.com/ Software systems consulting in Europe, North America, and Japan