24 Jul
2012
24 Jul
'12
1:51 p.m.
Morten Stevens mstevens@imt-systems.com writes:
So it is now RFC compliant. Anyway I think delaying mail traffic is not a good solution.
Well, OK, if you not keen on greylisting, you can try greet pausing, which introduces a shorter delay.
It tests a bot's patience by inserting a pre-HELO pause. RFC allows 5 minutes before timeout. This is last week's stat for one of my mail server and the count of early-talker or early-disconnecter, almost all of which are bots. A greet pause of over 20s dumps a lot of bots. Expect to whitelist the odd server here and there because they've tuned their servers to some aggressively small RFC non-compliant timeouts.
Delay Disconnect/early-talkers
00 = 9
01 = 1
02 = 1
03 = 11
04 = 34
05 = 5
06 = 1
07 = 1
08 = 3
09 = 3
10 = 9
11 = 1
12 = 2
16 = 7
17 = 10
18 = 4
19 = 17
20 = 1161
21 = 431
22 = 61
23 = 43
24 = 13Joseph Tam jtam.home@gmail.com