On 29 Dec, Tim Lavoie wrote:
Speaking of spam, how have other people been doing since the earlier discussion on greylisting and/or blocklists?
Here's some greylist stats from some of the servers I administer.
# Summary: 13866 records, 10138 greylisted, 3728 whitelisted # Summary: 26987 records, 25403 greylisted, 1584 whitelisted # Summary: 43094 records, 40437 greylisted, 2657 whitelisted # Summary: 2811 records, 2659 greylisted, 152 whitelisted
Since I've yet to be made aware of any false positives, and since around 95%+ of whitelisted emails appear to be non-spam, you can get a taste of how much spam is being blocked by this technique alone.
That's with a retention of 5 days for grey, 30 for white.