20 Oct
2009
20 Oct
'09
10:38 a.m.
Stanislav Sinyagin wrote:
last AprilMartin Blapp has presented a nice concept at SwiNOG:
instead of greylisting, the SMTP server delays the first OK response to HELO/EHLO for 30 seconds. That is usually enough for the vast majority of spambots to give up.
On a heavy traffic mail server, you probably run into a max session problem when you try to hold many idle connections for 30 seconds.
- Dan