Postfix and greylisting
 

I'm going to implement greylisting on my mailserver but not sure what to use.

So is there "de-facto" greylisting software for postfix? Gld? Postgrey? Any software I should not even consider?

Mysql support would be nice but not "must have" functionality, what I need is stable and working solution.

Ofcourse if you think I shouldn't use any greylisting at all you can share your opinion :)

Currently I'm using few rbl lists and spamassassin and it's working fine but as traffic increases I think that greylisting can help to reduce load on server.

postgrey

+1 for postgrey.

Occasionally I scan my mail server logs for (spam) grey-list rejects that don't retry. In my case, it looks like it reduces the spam load by about 60%.

Thanks, so postgrey it is.

Using few rbl's seems to cut over 90% spam but implementing greylisting before rbl's should reduce network load a bit I think. Not necessarily in noticeable amounts on small systems (like mine is at the moment) but in larger systems I think it makes big difference.