RE: SPAM filter...

["sietze" <sietze () sistemaseuropeos com>]

MDaemon (for Windows)from www.altn.com, and no doubt other programs do,
something similar.
After a configurable number of mistries the sending IP is chucked into the
"tarpit". A configurable, deliberate delay is added to every SMTP command
from the tarpitted IP so further attempts are discouraged. Not as severe a
method, but very effective as well. Legal senders will still be able to
deliver from that IP, though with a delay.

> Kerio MailServer, although not open source, has a "max. number of unknown
> recipients (directory harvest attack protection)" feature. I have enabled
> this on my email server, and have it set to 5. Therefore, when
> the spammer
> guesses five incorrect email addresses, the mailserver will block the
> spammers IP. It is very effective.
>
> -Paul Kurczaba
> ----- Original Message -----
> From: "Vedantam sekhar" <sekhar56us () yahoo com>
> To: <security-basics () securityfocus com>
> Sent: Saturday, December 13, 2003 1:04 AM
> Subject: SPAM filter...
>
>
> > Dear All,
> >
> > Can any body suggest me the mail filter
> > software(Opensource :-)) which can avoid the
> > dictionary atttacks on the server.Our mx server has
> > Solaris O.S.
> >
> > The spammmers are trying to find out the Valid E-mails
> > by blindly sending mails to randomly selected
> > characters as receipent ID?
> >
> >
> > Thanks
> >
> > V.N.SEKHAR
> >
> >
> >
> >
> >
> > __________________________________
> > Do you Yahoo!?
> > New Yahoo! Photos - easier uploading and sharing.
> > http://photos.yahoo.com/
> -----------------------------------------------------------------
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> -
> >
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> ---------
> --
> >


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