Re: Exchange 2000 Being used as Relay
From: Enno Lenze (nntp_06_at_verbrennung.org)
Date: 09/09/04
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Date: Thu, 09 Sep 2004 09:42:13 +0200
> First, where is the e-mail postmaster@mydomain.com address
> come from? It's not anywhere on my server.
Well, everyone on the net can send with every adress, thats theproblem.
View the header.
> Second, I have the Default SMTP Virtual Server set to
> default, which MS calims, Open relay is closed.
Test ist:
start -> run command
telnet SERVER 25<enter>
on the promt write:
helo<enter>
mail from:geroge@whitehouse.gov<enter>
rcpt to:nntp_06@verbrennung.org<enter>
Subject: foobar!<enter>
just a test<enter>
.<enter>
quit<enter>
if i ge a mail from george we kno that you have an open relay :)
> Users receive many SPAM mails. one of the user receive
> SPAMs that are sent to (on the TO filed) an e-mail address
> that is not in our network and yet it's going into his
> mailbox, example, billy@mydomain.com. I don't see that
> the message was BCC either. How is this occuring?
_B_CC fields are not visible usually. Its the _blind_ carbon copy :)
the mail is maybe FROM me@here.com TO you@there.com BCC user@yourdomain.com
On thing against spam (which works here for about 95% of spam) is gray
listing.
The first time a mail is delivered you response an error 450 (pleaase
try again). 95% of the spammers wont try again. Every normal configured
mailserver will try again.
But i dont know how to do taht with exchange. Im still looking for good
spam prevention in exchange 2k as well.
hth, enno
-- http://www.verbrennung.org This message was send early in the morning. Please don't blame me, if it makes no sense.
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