Good Afternoon,

We are using Mailman 2.15 and have an unusual problem that I was hoping that someone can help me with. We have close to 109 lists running successfully, however there are times when bounce processing sends the following message (over 100 times) in the span of a few hours to one user/subscriber to the list. They are not the admin:

This is a Mailman mailing list bounce action notice:

List:       list-society

Member:     Name

Action:     Subscription disabled.

Reason:     Excessive or fatal bounces.

The triggering bounce notice is attached below.

Questions? Contact the Mailman site administrator at

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The original message was received at Mon, 7 May 2012 09:50:13 -0400 from localhost [127.0.0.1]

----- The following addresses had permanent fatal errors -----

(reason: 550 5.1.1 unknown or illegal user: 

(reason: 550 #5.1.0 Address rejected.)

(reason: 550 Host unknown)

I understand why a user would get this message if they exceeded their threshold, but why are over 100 of the same messages being sent to one individual.

Thank you,

RF