Spam problem!

[Bill Moran]

Olga Zenkova <siro200 at yahoo.com> wrote:

> I use sendmail 8.13.3 and gather full log of its work.
> I see such strings in it:
> 
> <<< RCPT TO: user1 at domain.com
> >>> 250 2.1.5 <user1&domain.com>... Recipient ok
> <<< RCPT TO: user2 at domain.com
> >>> 250 2.1.5 <user2&domain.com>... Recipient ok
> <<< DATA
> <<< To: user3 at domain.com
> 
> where user1, user2 - users names
> domain.com - domain name
> 
> After that user1 and user2 get spam letters to their
> mailboxes with field "To: user3" in it. There are no
> user1 or user2 in this field. Is it possible to cut
> off these letters? Especially it is difficult to
> explain for user1 and user2 why they got letters
> addressed not for them.

Spam prevention is a _huge_ topic.  Mainly because everything and anything
you do to try to prevent spam, spammers will work to circumvent.

I would suggest lots and lots of reading on the problem.  Research spamcop,
spamassassin, greylisting to start, plus any links that those point you
to.  You've got a lot of work on your hands to understand the problem
and effectively prevent it.

Alternatively, you can purchase a commercial solution.  There are many
appliances available.  Or you could hire an experienced consultant to
set up spam blocking on your existing server.

Good luck.

-- 
Bill Moran

Time for some thrilling heroics.

	Jayne Cobb