Msg#: 3397085 posted 9:21 am on Jul 18, 2007 (gmt 0)
Greylisting (sometimes spelled graylisting) is a method of defending electronic mail users against e-mail spam. A mail transfer agent which uses greylisting will "temporarily reject" any email from a sender it does not recognize. If the mail is legitimate, the originating server will try again to send it later, at which time the destination will accept it. If the mail is from a spammer, it will probably not be retried, and spam sources which re-transmit later are more likely to be listed in DNSBLs and distributed signature systems such as Vipul's Razor.
Msg#: 3397085 posted 9:59 am on Jul 19, 2007 (gmt 0)
I haven't gone over to it yet; but I've been informed that they don't support resending, which is ridiculous, and i think probably wrong, but i'd rather have seen if anyone has implemented it without issues.