Re: How to force routing between two internal smtp domains across Two Edge servers

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M

MATTBN12345

yes, it seems a bit strange, but:

Company A acquired company B. Exchange organization of the " A" company was extended to the " B" company.

A VPN (with restricted bandwidth) exist between " A" and " B" . A large amount of messages (with large attached files) is sent between A & B.

As the VPN will not be upgraded before 1 year, we want to minimise the traffic bewtween " A" and " B" .

Matt
 
G

Gulab Mallah

Sounds interesting, so it's two forest scenario!
Mail flow shouldn't be a problem but is it the only thing you are looking for bewteen these two Org?

Gulab | Skype: gulab.mallah
 
M

MATTBN12345

No, only one forest. Company " B" has joined company " A" forest
 
M

mjolinor

In that scenario, the solution I gave you may not work for forcing internal email between recipients in the two domains to use the Edge servers if both domains exist in the same organization. That will work for routing inbound external email, but I don't know if it will work for internal email.

If that VPN is over the same public nework connection your Edge servers are using, it doesn't sound like you're gainging anything. If your VPN is bandwidth constrained by that connection, the traffic between the Edge servers will be using that same pipe, and will be just as constrained.

[string](0..33|%{[char][int](46+(" 686552495351636652556262185355647068516270555358646562655775 0645570" ).substring(($_*2),2))})-replace " "
 
M

mjolinor

I'm not coming up with anything that's going to do what you're after. I think the die was cast when you brought the other company's Exchange servers into your org. Internal mail routing to those servers is now determined by your AD site tolology, and will use your AD site links, and I can't find any routing options that would circumvent that.[string](0..33|%{[char][int](46+(" 686552495351636652556262185355647068516270555358646562655775 0645570" ).substring(($_*2),2))})-replace " "
 
B

Brian Day MCITP

This is what I'm coming up with as well, but I'll do some more digging.

Essentially an internal mail relay for the shared SMTP space may have been better and is often used for situations like this before the more complete migration is finished.

Let's say Contoso buys Fabrikam and have individual Exchange orgs, but you want the Fabrikam users to now have @Contoso.com addresses. The Fabrikam admins add @Contoso.com to their EAP (Let's assume for now there are not duplicate user names in each org) to generaet @Contoso.com email addresses for their users.

Then Contoso changes the @Contoso.com accepted domain to an internal relay and specify Fabrikam's Edge (or whatever SMTP devices they have) as the destination server for any recipient not found locally.

Now when Contoso.com receives mail for a user @Contoso.com email address it first tries to deliver the mail locally like it always has. Now that @Contoso.com is an internal relay, If it cannot find the recipient within its own org, it sends the email off to Fabrikam's org to attempt delivery there.

Microsoft Premier Field Engineer, Exchange
MCSA 2000/2003, CCNA
MCITP: Enterprise Messaging Administrator 2010
Former Microsoft MVP, Exchange Server
My posts are provided "AS IS" with no guarantees, no warranties, and they confer no rights.
 
M

mjolinor

I've done consolidations like that, setting up the new company as an internal relay domain. In some cases we'll set them up as an external relay domain in advance, change their MX records to point to our Edge servers, and then use those to relay back to them for a couple of days so that we can do a clean cutover without having to worry about stale MX records. Once you create mailboxes with those addresses in your org, the categorizer is going to make the routing decisions and there doesn't seem to be much you can do to override it.[string](0..33|%{[char][int](46+(" 686552495351636652556262185355647068516270555358646562655775 0645570" ).substring(($_*2),2))})-replace " "
 
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