Am 05.07.2011 16:55, schrieb Wietse Venema: > If no such problem exists, then we know that cache expiration > has nothing to do with the issue and we can move on. > > When the address verify cache works properly, it should become > populated over time (by spammers, by legitimate sites that have > very short SMTP timeouts, or by legitimate sites that try to deliver > to the backup after the primary replies with a 4xx response). > > There is no need to turn Postfix into a backscatter source by > accepting all mail when the primary is down. Just set the cache > expiration time to 100 days or so. Meanwhile I'll see if it is safe > to purge a recipient from the cache when the primary says that it > no longer exists. Maybe Postfix needs to wait for two negative > responses.
sorry - but how should this work? suggesting the primary is 99.9% of the time up there comes nothing to the backup-mx and if it comes there it is too late
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