Quoting Derrick:

> I'm just wondering how people are greylisting, I've come across a few 
> methods:

It seems that everybody has his own greylist implementation. I'm no 
better: http://plonk.de/sw/exim/greylist.txt

> Any drawbacks?

The usual one's: Broken/unorthodox mail servers that do strange things 
on 4xx.

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