This is a Mailman mailing list bounce action notice:

    List:       %(listname)s
    Member:     %(addr)s
    Action:     Subscription %(negative)s%(did)s.
    Reason:     Excessive or fatal bounces.
    %(but)s

%(reenable)s
The triggering bounce notice is attached below.

Questions?  
Contact the Mailman site administrator at %(owneraddr)s.
