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Re: [anti-spam-wg] greylisting

  • To: Bruce Campbell <
  • From: Florian Weimer <
  • Date: Tue, 20 Dec 2005 15:58:29 +0100
  • Cc: RIPE anti-spam WG <

* Bruce Campbell:

> When talking about Greylisting, most people critical of the 
> tempory-reject-please-retry behaviour tend to ignore or forget that this 
> behaviour is only on the first delivery attempt of the mail.  On later 
> attempts, the receiving machine already has the matching tuple within its 
> database, and allows the mail through. 
> (sendingdomain+sendingIP+receivingaddress)

Doesn't match my experience.  Most sites seem to expire the records
pretty fast (strictly speaking, you have to, for privacy reasons), in
the order of days instead of weeks.

Certainly, the effect is not restricted to parties "that have not
previously communicated".