How to Configure Cross forest connectors (Mail flow) Exchange 2010 to Exchange 2010

Source Domain – CareExchange.in

Target Domain – TargetExchange.in

Lets say CareExchange.in is migrating mailboxes across forest to TargetExchange.in

For Exchange TestUser@CareExchange.in  is migrated from CareExchange.in to TargetExchange.in

But still the administrator looks for a solution that TestUser has to receive email of “CareExchange.in” , Until the migration gets over completely. (As Mx Record will be changed only in the end of the migration)

Its kind of setting up cross forest coexistence mail flow between Two Exchange 2010 Forests.

Configuring Accepted Domains  –

First Make Sure – The Domain is Set to Internal Relay (In Source Domain – CareExchange.in)

Organization Configuration – Hub Transport – Accepted Domains – Right Click Properties

And Login to Target Domain – TargetExchange.in

Organization Configuration – Hub Transport – Accepted Domains – Right Click New Accepted Domain

Configuring Send Connector on the Source Domain (CareExchange.in) –

Note : (CareExchange.in) Email Hits the Source Server . Searches for the user ,

When User Exists , Email is delivered

When user does not exist , Send the email to the target domain .

When User does not exist on source and destination domain , there is a possibility where NO NDR Gets generated

So try to Have this solution for a short period of time.

Login to Exchange 2010 Server – (Domain – CareExchange.in)

Organization Configuration – Hub Transport – Connectors – New Send Connector

Name  – Cross Forest Connector

Intented Use – Custom

Address – CareExchange.in (SourceDomain)

Cost – 1

(If you already have a connector with Cost 1 – No problem , Please continue)

Choose – Route Email Through the following smart hosts

Enter the  Destination Exchange Server IP address.

Make Sure IP is pinging and reachable

Choose Authentication is None

If you wish to use TLS , Follow the below link

http://technet.microsoft.com/en-us/library/bb123546%28v=exchg.141%29.aspx

Now Send Connector is Configured on the source Domain

Configuring Receive Connector on the Target Domain (TargetExchange.in) –

Login to Exchange 2010 Server – (Domain – TargetExchange.in)

Server Configuration – Hub Transport – Default Connector – Right Click Properties

Click on ADD  – Receive Mail from Remote Servers that have these IP Addresses

Enter the Source Domain Exchange Server (CareExchange.in) IP Address

If you have Mutiple HUB Servers configured on the Send connector

Make sure you add all the HUB Transport Servers IP address

Add the IP – Apply – Ok

Hope I made it clear