[ih] update about bogus list unsubcribe requests

[John Levine]

>The issue appears to be that one subscriber to this list was using a
>commercial service that automates list removal.

That's sort of the problem.  The rest of it is that the address was at
a domain that was abandoned years ago, and the entire domain is now a
spamtrap.  The address bounced for quite a while, so normal list
bounce processing would have removed it.

If this list is like many other old mailman lists, it does no bounce
pruning at all, with predictably unfortunate results.

R's,
John