New Domain name and Name format changes Exhc 2007

Posted on 2011-03-22
Last Modified: 2012-05-11
Our company has a new CEO and he wants changes made to our existing e-mail system.
Currently our system has a domain of as it's Primary and the user mail boxes are set up with via the template.

The Changes are;
Change the domain to  and the name to

What is the best way to apply this to our Exchange Server without disrupting the current setup?
We want to maintain the OLD e-mail address but change the default address to the new naming conventions and set the default reply address to the new address as well..

Question by:NaplesFLDave
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Expert Comment

ID: 35191580

Overview of the process:

Organization Configuration > Accepted Domains > New Accepted Domain and configure a new Authoritative Domain
Organization Configuration > Accepted Domains > Select the new domain and Set as Default
Organization Configuration > E-mail Address Policies > New E-Mail Address Policy, All recipients types, no conditions, Add an SMTP address using first name.last name, select accepted domain for email address (select your new one). Apply it immediately and complete the wizard.
Recipient Configuration > Mailbox, Select a test user and change the primary SMTP address (properties, Email addresses, select the new, set as reply)

Test that user is OK, then roll it out to all users :)

There is nothing there you can't roll back very easily.


Expert Comment

ID: 35191636
Sorry, just had a better thought - Don't create a new Email Address Policy! It's a similar process but rather than adding a new Email Address Policy, just modify the existing Default Policy. This is a better option because it will already have the old addresses in the policy, you can add the new SMTP address and then apply it.

Sorry, my fingers typed faster than my brain worked


Author Comment

ID: 35191855
I have 2 questions to the above process.
1) If I modify the default policy won't the current default SMTP address get changed, thereby making all current inbound messages bounce?
2) You wrote:
Recipient Configuration > Mailbox, Select a test user and change the primary SMTP address (properties, Email addresses, select the new, set as reply)
Does that mean I will have to visit Every mailbox to change this setting?
And we had a concern that if we opened each mailbox, unchecked the policy applied box, made the changes we wanted, rechecked the policy box, that the next time the Exchange server did a policy update it would set it back.?

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Expert Comment

ID: 35191935

1) If you modify the default policy you will be adding a new SMTP template for the addresses - the old addresses will still be there, and if you don't "set as reply" the new address, it will just be an alias. At the point when the policy updates the users, the new addresses will be added and the users will receive email sent to them on the new address, as well as the old address.

2) Updating a single user is for testing purposes, so you can test mail flow with the new address space - when you want to update everyone's primary address, you can simply edit the default address policy again and "set as reply" the new address/domain. You can uncheck the policy box for the user to stop the policy being enforced for them - re-check it before you want to enforce a policy change.

I hope that makes sense, my first two posts were a little rushed, sorry. So the high level is:

Add the new domain as an Accepted, Authoritative Domain
Update the default policy to include the new SMTP address and apply it to your users. All users will then have an alias on the new domain but still be using the old one as their primary
Modify a test user and set the new domain email address as the primary (set as reply) and test the mail flow in and out.
Once you're happy, modify the default policy again and "set as reply" the new SMTP address


Author Comment

ID: 35192016
So that I am clear on this topic... When I change the default policy to the new it will ADD it to the user's mail box SMTP list and NOT Remove the OLD PREVIOUS SMTP address that was being used as the default address?


Accepted Solution

Saoi earned 500 total points
ID: 35192074
Exactly, if you look at the policy here you can see the default one is in bold, and there are secondary ones that are not. If "" was your old previous SMTP domain, and I had just added as your new SMTP domain, the old one would still be present when I apply the policy.

Editing E-mail Address Policy
Best to be clear about these things!

Author Comment

ID: 35192180
OK. I think I got it.

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