The UNSUBSCRIBE command has failed, and a message to this effect has
been sent to the mailing list owner.  There are several reasons why
you may not be able to unsubscribe from the mailing list:

1. The From: header on your message to the server doesn't match the
   address you SUBSCRIBEd to the list with.

2. You were not subscribed in the first place.

3. The messages sent to you may be from a secondary list "exploder",
   which acts as a relay for this mailing list.  If this is the case,
   contact the management at the system acting as the relay.


