What are grey lists ?
The system of the Grey List has the advantage of making the rate of Spam collapse by more than 90% Here in a few words is the principle: The grey list rests on the fact that the majority of spammers send thousands of chain e-mails to many mail servers, starting from PCs on which a temporary and non-official server was installed. They do not respect the standard operation which requires that in the event of failure of the routing, the transmitting server MUST re-send its mail. The spammers almost never re-send their mails destined to their correspondents. On the basis of this principle, the system of grey lists consists in refusing all the mails received at the time of first presentation, and waiting for their re-sending on behalf of the transmitting server, before accepting it definitively. Result: more than 90 % of the Spam is rejected.
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