Received an unsubscribe confirmation notice that did not originate with me.

Curious as to how this could have happened. 

This Mailman 2.1.39 list is hosted by DreamHost, so I don't have access to its 
internal workings. 

Does this mean a breach in security?

 
>Mailing list removal confirmation notice for mailing list RE-wrenches
>
>We have received a request for the removal of your email address,
>"[email protected]" from the
>[email protected] mailing list.  To confirm that you
>want to be removed from this mailing list, simply reply to this
>message, keeping the Subject: header intact.  Or visit this web page:

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