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From: Ace Fekay [MVP-DS, MCT] on 10 Jan 2010 12:43
"Jim" <jim(a)dontwantspam.com> wrote in message
news:hic85c$286f$1(a)energise.enta.net...
> >be forewarned anyone from the outside world can send through it, such as
> >spammers.
>
> How are they going to do this ? when I restrict it to *only* receive
> incoming connections from the LAN from a single LAN IP address ?
>
> I am removing the 0.0.0.0-255.255.255.255 and substituting this with the
> single LAN IP of the telephone PBX.
>
> The software vendors instructions are to do this also but to use Windows
> Intergraded authentication also..
>
> But as we've seen their older version of their software doesn't seem to
> want to work with Exchange 2007 in the same way that Outlook 2003
> doesn't...hence the need to go back to a similar model as used in Exchange
> 2003.
>
> I've tried to send through an authenticated SMTP connection from another
> PC whose IP address isn;t in the allow list and I can confirm that it
> doesn't work..
>
> It only works from the IP address which I have allowed.
>
> Have you tried to setup and IMAP account in Outlook 2003 and tried to
> reply to a message received via IMAP and sent back out to your Exchange
> Server 2007 using an authenticated SMTP connection from Outlook 2003 ?
>
> I'll bet it doesn't work...
>
> Try the exact same thing from Outlook 2007 and it will..
>
> Why I wonder ? what's the difference between Outlook 2003 and Outlook
> 2007 regards this ? obviously something different somewhere..
>
> Jim.
>

I'm not sure where the difference lies with Outlook 2003 and 2007, but what
I was saying about allowing relaying (without creating an additional SMTP
receive connector requiring an additional IP), it will open up to the
internet, since that is what the server's using to receive outside mail.

Ace



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