Answer: In the past when we had to forword emails to external email address we had to use Active Directory Users and Computers to create the contact and then use the Exchange Server console to forwaord the email.
With Exchange Server 2010 this task is being done from the EMC and takes couple of minutes.
To forward emails to External contact in Exchange Server 2010 follow the steps below.
Step 1 – Create mail contact
Go to EMC -> Recipient Configuration -> Mail Contact
Right Click on a blank spot and Click on New Mail Contact
Select New Contact and Click Next
Fill in the details and make sure you type the correct external email address.
Click On Next and New.
Step 2 – Forward Emails to external email address.
Find the user you need to forward his emails to external email address and right click on his account and click properties.
In the properties page go to the Mail Flow Settings tab and click on Delivery Options.
On the Delivery Option page Tick the Forward To and click on Browse
Select the mail contact we created on Step 1.
Click OK, and test.