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

[Julian Field]

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telnet port 25 and time the gap between the connection opening and the 
greeting text appearing.

James L. Day wrote:
> How can I tell if Sendmail's greetpause is working?  I don't see any
> evidence in the log files..
> 
> Thanks,
> Lynn
> 
> 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:127.0.0.1    0
>>
>> Regards
>>
>> Jim Holland
>> System Administrator
>> MANGO - Zimbabwe's non-profit e-mail service
>>
>>   
> 

- -- 
Julian Field
www.MailScanner.info
Buy the MailScanner book at www.MailScanner.info/store

MailScanner customisation, or any advanced system administration help?
Contact me at Jules at MailScanner.biz

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