13 Feb
2006
13 Feb
'06
5:10 a.m.
I have been playing around with greylisting recently on a couple of test domains and it works pretty well (reduces the number of spam coming from malwared machines who don't retry sending their spam by over 90% before any spam checkers get to it), but I've noticed a number of real mail NZ servers not knowing what a 451 SMTP message is, and they treat it like a fail and they don't send the message again. (Yes I know I can whitelist good known NZ SMTP Serversto not Greylist from them) If anyone else has tried greylisting before , or has any comments on it, let me know. Thanks Craig