This is a Mailman mailing list bounce action notice:

    List: curl-library
    Member: nick.warrington_at_paconsulting.com
    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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attached mail follows:

The original message was received at Sun, 8 Nov 2009 07:07:53 +0100
from localhost.localdomain [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<nick.warrington_at_paconsulting.com>
    (reason: 554 email rejected due to security policies - MCSpamSignature.sa.28.5)

   ----- Transcript of session follows -----
... while talking to service16.mimecast.com.:
>>> DATA
<<< 554 email rejected due to security policies - MCSpamSignature.sa.28.5
554 5.0.0 Service unavailable
<jpb_at_rrette.com>... Deferred: Name server: rrette.com.: host name lookup failure