OT - Greylisting (was: Re: gOCR SpamAssassin plugin)

James L. Day lday at txk.k12.ar.us
Sat Aug 12 17:40:12 IST 2006

How can I tell if Sendmail's greetpause is working?  I don't see any
evidence in the log files..


Jim Holland wrote:
> On Sat, 12 Aug 2006, Julian Field wrote:
>> Kevin Miller wrote:
>>> Michael Baird wrote:
>>>> Greylisting decreases load immeasurably on a mailscanner system, the
>>>> cost of greylisting is much less then allowing the message to go
>>>> through the mailscanner sytem. I deployed it several months ago, it
>>>> really is a good tool, and I've had very few complaints (10000 users).
>>> I just use Sendmails greet pause which is 10 seconds to set up and works
>>> a treat - does greylisting add significant control or improvement over
>>> that?  Anybody using them in tandom or is one or the other to be
>>> preferred?
>> I use both, and I have had to turn the greetpause setting down to about 
>> 2 or 3 seconds, as some systems (such as NTMail) don't check properly 
>> for the welcome message before sending the HELO or EHLO. At that sort of 
>> setting, it has little benefit. And there is no easy way to set up a 
>> whitelist with greetpause.
> I just put "GreetPause:<ipaddress> 0" entries in the access file before 
> the default entry.  See sendmail notes:
> 	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:    0
> Regards
> Jim Holland
> System Administrator
> MANGO - Zimbabwe's non-profit e-mail service

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