Stop SMTP attack with pam_abl

[Lena at lena.kiev.ua]

> I have different sendmail based servers deployed and all of them are, 
> more or less frequently, subject to dictionary attacks.

> P.S. I'm not sticking with pam_abl if a better solution exists...

In Exim this can be done without separate software,
just with additions to config:
https://github.com/Exim/exim/wiki/BlockCracking
(this blocks both using stolen passwords and dictionary attacks).