Olga Zenkova <[EMAIL PROTECTED]> wrote:
> I use sendmail 8.13.3 and gather full log of its work.
> I see such strings in it:
>
> <<< RCPT TO: [EMAIL PROTECTED]
> >>> 250 2.1.5 <user1&domain.com>... Recipient ok
> <<< RCPT TO: [EMAIL PROTECTED]
> >>> 250 2.1.5 <user2&domain.com>... Recipient ok
> <<< DATA
> <<< To: [EMAIL PROTECTED]
>
> 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
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