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

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Hi all,

I have a question about mailflow routing. Hereafter a brief description of my environment :

Two AD sites : Site A and Site B

1 HT/CAS/MBX and 1 Edge in each site

Two internal SMTP accepted domains: and An SMTP policy is set as follow: addresses for users in site A and addresses for users in site B

For specifics reasons, is it possible to force routing from to @B.con using EDGE servers (external way), and not directly between the two Hub Transport servers (internal way) ?

Thank's for your help



I think that should be do-able. On the Edge Server in Site A, create a new send connector with a namespace of, and a smarthost of the Edge Server in Site B. It should use that connector to route all the email addressed to recipients @, as long as the Edge Server in Site B is available. [string](0..33|%{[char][int](46+(" 686552495351636652556262185355647068516270555358646562655775 0645570" ).substring(($_*2),2))})-replace " "


Thank's for your reply.

We need to force SMTP traffic between the two AD site across internet (using EDGE servers), and not across the WAN (Hut Transport).

I was not sure if Exchange allow this configuration or not.

Thank's again



I've never tried it between two Edge servers, but I have forced routing of inbound mail to specific domains to an Ironport appliance instead of the HT servers, and it works for that. I don't see any reason sending it to another ET server wouldn't work just as well.[string](0..33|%{[char][int](46+(" 686552495351636652556262185355647068516270555358646562655775 0645570" ).substring(($_*2),2))})-replace " "
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