[Mailman-Users] Valid emails being unsubscribed?

[Steve Wehr]

Hi Mark and friends,

I host about 100 mailing lists for clients, and have recently moved to a new installation of mailman. My clients are telling me they get lots of notices of people being unsubscribed from their lists, that they never got before, on the older version of mailman.

I've been trying to validate the unsubscribes, but I'm not sure how to do it. I look in mailman's bounce log, and see that bounces are being received and users are being unsubscribe. I looked in the postfix maillog, and I see successful sends to these users, then a bounce would be returned. 

I've done some spot checks by sending an email from my personal email account to a few of the users who have been unsubscribed, and all those emails go through successfully and are not bounced back to me. The users tell me they are not unsubscribing from the list. I've also see some emails being unsubscribed in the bounce log, that I personally sent to and know that those are valid email addresses.

Where could I go to learn more about why bounces are received, and try to debug this problem? Does the community have any suggestions for me? Thanks.

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Steve Wehr 
Tunedin Web Design
www.Tunedinweb.com