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How to forward emails from Exchange1 to another Exchange2 without creating mailboxes in Exchnage1 ?

Posted on 2016-08-18
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Last Modified: 2016-08-22
We have a newly acquired company with one Exchange 2010 called Exchange2 and the domain say domain2.com. We want their emails coming to our HQ Exchange server firstly and then got forwarded to Exchange2 without creating their user mailbox in HQ Exchange server. Is it possible? How?
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Question by:Castlewood
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9 Comments
 
LVL 27

Expert Comment

by:☠MAS☠
ID: 41761282
This expert suggested creating a Gigs project.
Hi Please do as below.

On exchange1 -> EMC -> org config -> Hub transport-> Create a send connector and make it use the IP of Exchange2 as smart host relay.
https://technet.microsoft.com/en-us/library/jj839710(v=exchg.141).aspx

On exchange2 -> EMC -> server config -> hub tranposrt -> create a new receive connector make it accept connections from the IP of Exchange1 and allow relaying on it.

Create Receive connector https://technet.microsoft.com/en-us/library/bb125159(v=exchg.141).aspx

Use this to allow relay.
https://www.experts-exchange.com/articles/2666/Allow-relaying-on-Exchange-2007-Exchange-2010-in-4-easy-steps.html

Thanks
MAS
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Author Comment

by:Castlewood
ID: 41761347
I need to put the newly aqcuired company's domain name (domain2.com) into the Accepted Domain on HQ Exchange, correct?
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Accepted Solution

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☠MAS☠ earned 2000 total points
ID: 41761413
I apologize for that missed part.

On exchange1 -> EMC -> org config -> Hub transport-> Send connectors --> Create a send connector and make it use the IP of Exchange2 as smart host relay.
https://technet.microsoft.com/en-us/library/jj839710(v=exchg.141).aspx

On exchange1 -> EMC -> org config -> Hub transport-> Accepted domains-->Create a domain as internal relay.
New-AcceptedDomain -Name "Domain2" -DomainName domain2.com -DomainType InternalRelay

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On exchange2 -> EMC -> server config -> hub tranposrt -> create a new receive connector make it accept connections from the IP of Exchange1 and allow relaying on it.

Create Receive connector https://technet.microsoft.com/en-us/library/bb125159(v=exchg.141).aspx

Run this command to allow relaying on the connector created above
Get-ReceiveConnector <NEWCONNECTORNAME> | Add-ADPermission -User "NT AUTHORITY\ANONYMOUS LOGON" -ExtendedRights "ms-Exch-SMTP-Accept-Any-Recipient"

Open in new window

Use this to allow relay.
https://www.experts-exchange.com/articles/2666/Allow-relaying-on-Exchange-2007-Exchange-2010-in-4-easy-steps.html

Thanks
MAS
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Author Comment

by:Castlewood
ID: 41761443
A side question....
In HQ Exchange I've had an existing Send Connector (#1) which is with '*' in Address Space where the '*' I believe means ALL. You now want me to add one more Send Connector (#2) with the Address Space = *.domain2.com. It seems the two address spaces have an overlapping area. So my concern is, would an email intended to domain2.com be handled by the #1 Send Connector instead of the #2 ? In another word, how does an Exchange server determine which Send Connector to go to if the Address Spaces overlap?
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LVL 27

Expert Comment

by:☠MAS☠
ID: 41761466
You will have 2 send connectors in your HQ exchange server.
1 with address space "*" and with cost 2
2 with address space "*.domain2.com" and with cost 1

Thanks
MAS
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Author Comment

by:Castlewood
ID: 41761472
I got your idea. The different cost makes it work, just as the "metric" plays in IP routing -- the lower value the higher priority. Currently both connectors are with cost = 1. I'm gonna change it.  
Thanks for help.
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Author Comment

by:Castlewood
ID: 41761636
Hi MAS,

Want to verify the necessity of creating a Receive Connector on Exchange2 since
1. Exchange2 is the final destination with Mail boxes so don't need relay. Conversely besides the Send Connector, shall we need to create a new Receive Connector on HQ Exchange to receive and relay domain2.com emails to Exchange1 ?
2. the existing Receive Connector already covers ALL ip addresses (received from a filtering smart host)

What you think?
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LVL 27

Expert Comment

by:☠MAS☠
ID: 41761646
1. Exchange2 is the final destination with Mail boxes so don't need relay. Conversely besides the Send Connector, shall we need to create a new Receive Connector on HQ Exchange to receive and relay domain2.com emails to Exchange1 ?

No need. You can send email directly out from Exchange2 if you have internet on Exchange2.
If you dont have internet you can do the same process vice-versa to send email out through HQ server.

2. the existing Receive Connector already covers ALL ip addresses (received from a filtering smart host).
If both the exchange servers are from different forest you have to create a receive connector to allow relay.

Thanks
MAS
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Author Comment

by:Castlewood
ID: 41761663
Sorry I got a typo. The previous question should be:

Shall we need to create a new Receive Connector on HQ Exchange to receive (from a filtering smart host) and then relay the domain2.com emails to Exchange2 via the new Send Connector?

The reason I'm confused is, look, it is the HQ Exchange who relays the inbound mails to Exchange2. Doesn't it need a separate Receive Connector with relay on HQ Exchange ?
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