[IMail Forum] Experience with "greylisting" antispam?

Tue, 24 Aug 2004 02:05:14 -0700

Does anyone have experiences with "greylisting" as
 
In short, this is a method to block spam by
a) Read and Store SenderIP/SenderAddress/RecipientAddress triplet
b) Deny mail with a temporary SMTP error (451 Try later)
c) Accept same mail when it is retrying after a specified waiting period
d) Accept same triplets for a specified time
 
As commercial spam is commonly sent by fire-and-forget engines, it will not be delivered.
 
Of course, this must be implemented on the MTA level. So far, I know of only one
Win32 based antispam product which implements this method (Xwall). 
 
Marius
 

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