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From: Wietse Venema (wietseporcupine.org)
Date: Mon May 13 2013 - 08:22:03 CDT
> I have postscreen running well after having it run in non-blocking
> mode for awhile, but I continue to see ?new? google servers every
> I?m not sure how many different mail servers google has (over 600
> have appeared in my logs), but it?s a large number, and each new
> one hits the postscreen and delays the mail. And it appears that
> sometimes, the re-attempt is from a different server, so it hits
> the postscreen again.
Don't enable the "after 220" tests, or wait until whitelisting
is stable. Given that Google has many servers, manual whitelisting
is not a long-term solution.