Re: Mail filtering with Exchange
From: Bob Cobb (bob_at_home.com)
Date: 06/21/04
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Date: Mon, 21 Jun 2004 20:00:23 +1000
"Chad A. Gross [SBS MVP]" <chad.gross@laytonflower.nospam.com> wrote in message...
> Nope.
>
> He's filtering inbound email and rejecting anything that claims to come from
> his own domain. Obviously, he can receive the mail succesfully if he
> disables the filter - but as soon as he disables the filter his ISP detects
> this during a nightly scan and threatens to disconnect & blacklist them (as
> a potential open relay???)
I find it hard to believe that an ISP would check all of its accounts each night, first to see if they run a mail server, and then
try to send email to a user inside the organisation from a spoofed email address, only to find that if it doesn't bounce from the
postmaster account, that they could be considered a relay.
My understanding is that if you tried to send an email, claiming to be user@my-company.com.au but were able to send email to
user@hotmail.com via mail.my-company.com.au while you are outside the organisation, then you are an open relay.
I thought the default install, and of course best practice was that the only way you could use mail.my-company.com.au to send mail
from outside the organisation was by sending your login credentials to the outbound mail server.
Of course I could be wrong, as I can't test it. We now use MM in front of Exchange, and my home ISP wont allow outbound port 25
unless it goes via its own mail server.
Bob
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