Greylisting.Org > Implementations



Greylist is simply a greylist program for Exchange 2003 ( should work on 2000 ) which will delay incoming mail for a couple of minutes. In a test environment it blocked 98% of all spam. More information:

XWall is a spam filter that supports greylisting for Microsoft Exchange (as well as other SMTP servers). It appears to be very capable in terms of the features listed on the website: