At 11:36 -0700 on 07/17/2007, Ned Freed wrote about Re: acceptings
particularly a message (3):
A significant
number of list managers that receive an authoritative indication
that an entire
group of addresses they just tried to send to are bad are going to
unsubscribe
them all right away rather than wait for a later probe to confirm that the
addresses are bogus.
If they are going to want to unsubscribe all the addresses, IMO, they
should first sanity check the list by either doing an immediate probe
to that list of addresses (and unsubscribe based on the results, thus
not unsubscribing the good addresses), or doing individual resends of
the message but this time sending one copy per address (in effect
doing the same thing as the probe and/or acting as if each address
was the only one at that domain/MX).