Michael Scheidell wrote:
Someone want to explain Greylisting?
It delays any email for up to 45 mins.
Usually not that long. In my experience a forced delay of 3 minutes and a grey period of 72 hours is enough to stop most spam. Granted, it then depends on the sending servers retry times, but many servers retries again after about 10 minutes. Only a few servers wait a slong as 45 minutes or more.
Ok if you don't mind waiting a long time for email.
ALso, you don't have to delay *all* mail. In the implementation I use a sending host will be whitelisted (from the greylist check) for 7 days after it has managed to get past it once (so that for 7 days no mail from that host will be subjected to the greylist). Also, we keep triplets white for 36 days. We also massacre the sender address a bit so that for most mailing lists only the first mail to a recipient is delayed. This means that the majority of mail we get are not delayed by the greylist. The greylist together with two different automatic black-lists (one short-lived and one longer-lived) means a less work for the system since a lot of spam is stopped without having to be checked with SpamAssassin. /Jonas -- Jonas Eckerman, FSDB & Fruktträdet http://whatever.frukt.org/ http://www.fsdb.org/ http://www.frukt.org/
