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rowan · 01-09-2007, 06:19 AM

Another method to reduce spam is to return a temporary error upon first delivery attempt, which will queue the email on the server trying to deliver it. Most email servers will attempt redelivery within a short period (say 30 mins) but bulk emailers don't usually bother. If there is a second attempt to deliver the same mail then the IP is whitelisted and further deliveries are allowed to come through unheeded. Bulk mailers don't try a second time so they're never whitelisted.

01-09-2007, 06:19 AM
rowan Too lazy to set a custom title Join Date: Mar 2002 Location: Australia Posts: 17,393	Another method to reduce spam is to return a temporary error upon first delivery attempt, which will queue the email on the server trying to deliver it. Most email servers will attempt redelivery within a short period (say 30 mins) but bulk emailers don't usually bother. If there is a second attempt to deliver the same mail then the IP is whitelisted and further deliveries are allowed to come through unheeded. Bulk mailers don't try a second time so they're never whitelisted.