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This new future will help if you use sendmail
greet_pause - Adds the greet_pause ruleset which enables open proxy and SMTP slamming protection. The feature can take an argument specifying the milliseconds to wait:
FEATURE(`greet_pause', `5000') dnl 5 seconds
If FEATURE(`access_db') is enabled, an access database lookup with the GreetPause tag is done using client hostname, domain, IP address, or subnet to determine the pause time:
GreetPause:my.domain 0 GreetPause:example.com 5000 GreetPause:10.1.2 2000 GreetPause:127.0.0.1 0
When using FEATURE(`access_db'), the optional FEATURE(`greet_pause') argument becomes the default if nothing is found in the access database. A ruleset called Local_greet_pause can be used for local modifications, e.g.,
--http://alanpae.tripod.com/sendmail/Databases.htm |
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