On Fri, Jun 15, 2012 at 11:25 AM, Shiv. Nath prabhpal@digital-infotech.net wrote:
I need help for STOP this spamers right now.
Thanks in advance to anyone who can guide me
[...]
i trust this helps, there is another solution but you do not use Postfix.
Sendmail is nearly infinitely configurable - and not all that complicated if you do it in sendmail.mc instead of .cf. But, the really quick fix is to drop in a couple of milters. milter-greylist is in the rpmforge repo and will tempfail everything the first time it sees a new sender (exceptions/timing configurable, of course). Most spammers don't retry, all real mail servers do, so at the expense of an occasional delivery delay you avoid most of the problem. MimeDefang is in both EPEL and rpmforge. It lets you control most sendmail operations in a small snipped of perl and allows you to run any tests you want, including rbls and spamassassin before the message is accepted at the smtp level. MimeDefang is flexible enough that you could add your own greylisting there, but it isn't included out of the box (but the author has a commercial solution that is more complete).