>>>Mailing List  Distribution <[log in to unmask]> has  just subscribed
>>>to the HWY61-L list (The Bob Dylan Discussion List).
>
>Looks to me like an address harvester for spam usage.  They have probably
>already unsubscribed from your list after issuing a review of your list.
>(either that or somebody is looking to get somebody's list spammed very
>badly as now any messages sent to your list will wind up on the other
>list(s) as well...)

Possible, but I doubt it.

Some sites subscribe to a mailing list under a single address and
redistribute the mailing list mail locally.  For instance, Brown University
has a netnews-like interface for many mailing list.

Drop 'em a line and ask 'em what's up is what I would do.

-jwgh