Luke S Crawford wrote: > considering just how many people use greylisting, this is likely a > bad idea. Greylisting works by rejecting the first message from a new > server with a 4xx (temporary) error code. If the server tries again > immediately or never tries again, it's probably a spammer. If the server > waits a reasonable period of time (say, 30 minutes) and then re-sends the > mail, it's probably legit, and the greylist program puts that server on the > whitelist so mail from that server goes through right away next time. > > Many people set things up such that if you try again immediately, you get > put on a blacklist, as you are probably a spammer. I really don't understand why people just don't turn off their mailservers if they don't want mail from others. Ralph
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