[ih] update about bogus list unsubcribe requests

[Joe Touch]

On 8/26/2016 1:28 PM, John Levine wrote:
>> 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.
We do use bounce processing, FWIW. It simply failed to work for this
address, for whatever reason.

More modern Mailman software may be better at dealing with cases that
our version fails on.

Joe