It seems that there's a half-decent way around it:
- keep a list of authorized posters (which could be a superset of the
mailing-list)
- when a mail comes from a non-autorized user, send back a request for
acknowledgement.
- the acknowledgment first adds the email address to the authorized-posters
list and second sends the actual mail to the mailing-list.
It's similar to auto-moderation except that it only happens once per email
address (unless you do a regular garbage collection of the authorized-posters
list to keep it within reasonable size)
Stefan
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