I guess that would work, I really don't want full DNS resolution between
us because I don't trust their computers to be 100% clean.  The VPN
Tunnel exists between us but B is limited as to the resources it can see
on A.  I suppose I could just do it one way so Company A's mail to B
will route directly over the VPN and B would come back over the net. 
Is it simple as adding the record to A's Forward lookup zone with the
modified MX and deleting the existing record from cached?

-----Original Message-----
From: Bill Humphries [mailto:nt...@hedgedigger.com] 
Sent: Friday, May 13, 2011 2:03 PM
To: MS-Exchange Admin Issues
Subject: Re: Mail flow question



How about: just setup each companies internal DNS zone with each other
and let it route mail by MX record?  Since they are part of the same
company and connected by VPN anyway, you might have some other benefits
as well linking DNS.

Bill

N Parr wrote:
> Company A - Exchange 2003 with Barracuda Company B - Exchange 2003 SBS

> relying on connection filter black lists.
>  
> A owns B and has VPN connection between.  A would like to change B's 
> MX to point to A's Barracuda for better spam/virus filtering, then 
> have Barracuda deliver mail directly to B's server over VPN.  This has

> already been tested to work.
>  
> Need to verify if setting up an SMTP connector on A's server to point 
> to B's server for internal mail delivery is required.  I'm thinking it

> would be because I could see issues with A's server trying to deliver 
> email to B's and having to loop out to it's own IP and come back 
> through the Barracuda.
>  
> Outbound from B would still go out their IP and it shouldn't be a big 
> deal for mail flow back to A to go through the net like normal.
>  
> I've googled for some examples of this but all I can find are examples

> of setting up a trust relationship between domains and I don't want to

> do that.
>
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