I was looking for a good list of ip ranges to whitelist and came
across one maintained at PureMagic.

Here's the current version:
http://cvs.puremagic.com/viewcvs/greylisting/schema/whitelist_ip.txt?rev=1.16&view=markup

While going over it, I read this:

# Because error code 450 is most commonly used for a mailbox lock failure,
# many sites seem to treat it as a very short duration failure, and will
# retry several times within seconds, and then bounce the mail, while they
# handle a code 451 more "normally".

When I checked my mail logs, sure enough, I saw various SMTP servers
try to immediately re-send a bunch of times all within 1 second of the
first 450 reject for being greylisted! These servers looked
legitimate.

So I looked for a way to try changing the reject code from 450 to 451
but couldn't find it.

Ideas? Comments?

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