On Mon, May 12, 2008 2:56 am, dc wrote: > I sent this first message on 7 May. And today, 12 May, almost 5 days later > (!), I'm told this message was rejected: > <[email protected]>: host smtp.shsu.edu[158.135.1.173] said: 451 4.7.1 > Greylisting in action, please come back in 00:10:00 (in reply to RCPT > TO command) > I'm curious: why does it take so long to reject a message?
Greylisting is a temporary rejection used to validate an address, and is usually only done once. (The header has code 451, "Message temporarily deferred") The sending mail host is supposed to retry; if it doesn't, the message is assumed to be spam because hit-and-run spamming machines don't retry. A number of mail servers don't respect retry requests. Retries are usually done by mail servers in a few minutes, an hour, a few hours, a day and a few days, after which they give up. It might just be a blip in the greylisting mechanism, too. It depends on what the rest of the header says; David Fenton might also help out here. Dennis _______________________________________________ Finale mailing list [email protected] http://lists.shsu.edu/mailman/listinfo/finale
