On Tue, 20 Mar 2007, Joe Emenaker wrote:
to deliver mail. Hosts that *aren't* on the list have their initial
connections dropped. If they connect again to try to deliver a little later,
then they're allowed to send and they're added to the whitelist.
They're not dropped, they're given a _valid_ "temporarily unavailable"
SMTP response. Legit MTAs should retry, although at least one of the
big email providers had braindead config that treated "try again later"
as "explode like a zeppelin full pyromaniac of chainsmokers in a
thunderstorm", at least a while ago. Spammers and the like tend to just
move on (for now) to easier pickings.
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