Regarding the frequent problem of people subscribing to a list
and setting forward to another address when the first address go
defunct, and then the problem of the list-owner to identify the
subscribed address when the second address goes defunct.
Is it technically possible to refuse sending a message to a
recipient if there is a .forward at the recipient, or if the
recipient address is closed even if the files are still there?
I guess the answer is "no", nut I'd like to know the exact reasons
why it can't be done. On the other hand, if it could be done,
by checking something and refusing to send the message if the
checking gave the wrong result, that would be a great feature