> Greylisting only delays mails. Proper spammers just use ISP relays and

> then they will try forever. Or they will just nicely do the full SMTP
> thing for the first message and try again later, or stall sending to you
> as the 450 is recognized and spam run you again later. So many easy ways
> around it and it only causes annoyance.

I don't know anything about proper spammers. Greylisting has reduced the 
amount of incoming spam significantly, probably at 90-95%. Of course there 
are spambots which play around greylisting, but they aren't yet that widely 
used. 

> On top of that, I guess you have whitelisted large mail providers like
> gmail who try to send a single mail from several IP's, thus hitting your
> greylist over and over again, and then just giving up? :)

some greylisting packages have their whitelists already pre-filled in the 
distribution package, so it works quite well (we used 
http://policyd.sourceforge.net/ , and I have no complaints about this 
software, and neither do the users.
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