[Mimedefang] Pre-greeting traffic.

[Joseph Brennan]

--On Thursday, April 12, 2007 15:56 -0400 "Mark G. Thomas" <Mark at Misty.com> 
wrote:

> On Wed, Apr 04, 2007 at 07:31:55PM +0100, G.W. Haywood wrote:

>> At the moment about half of the spam sources I see send pre-greeting
>> traffic (I'm using sendmail's greet_pause feature), but blocking on
>> that basis alone does give false positives, which I'd like to avoid.
>
> Really?  I haven't had any complaints about blocking any non-spam sources
> due to pre-greeting traffic, and we're handling about a million messages
> per week.  Right now we're using a greet_pause setting of 5000 (5 secs)
> and blocking about 45,000 connections per week with this rule.


Ours is 4000, and we reject a million a *day*, and after doing this
for over a year I am still not aware of a single false positive.

Joseph Brennan
Lead Email Systems Engineer
Columbia University Information Technology