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Ability to send from new domain

My company (Company B) has been acquired (Company A), and the Company A CEO wants Company B employees to immediately be able have a Company A email address.  So firstname.lastname@companya.com.  Due to SSO and other compliance issues, we cannot change our Company B domain yet.

How do I add the ability for Company B employees to send with a company A address, yet still be able to receive email from the old domain and new domain?  Both company's employees need to see each other in address books and I think I can accomplish that with contacts.
1 Solution
You didn't say what version of Exchange.  The following steps are for exchange 2003 however this is possible with any Exchange version.

You can open Active Directory Users and Computers, click the User, select the Email Addresses tab and add another email address.  As long as their primary is set to the appropriate company that they are sending from, they can receive mail on that email address.

You'll need to add a send connector to Company A to route email to your Mail server also.
AllosITAuthor Commented:
Sorry.  Exchange 2003 on Company B and 2007 on Company A.  Company B was beginning the process of moving to O365.  We still intend to move both companies to O365, but need to take care of this immediate issue.

Send connector?  Is that different than the mail recipient policy or don't even touch that?
One workaround would be to create Alias SMTP address

On company A start up “Active Directory Users & Computers”
Locate a user and look at the objects properties. Add a new alias: click New, select ‘SMTP address’, click OK and enter the company B email address.

Now if the email is sent to you company B address it will come to you company A email box.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
For Exchange 2003 you can add the other domain email address to recipient policy and have it applied to users .....
In Exchange 2007 add it to the Accepted Domain and add the email to the email address policy.

But users can always send emails only with Primary email address ... meaning only one email address can be used.

But there can be a workaround ..... but as these are 2 different ORGs how can user of Company A use the Company B email and send from its server as there is another server on the Internet that Authenticates email for it.

- Rancy
AllosITAuthor Commented:

Yes, Company B would not be able to receive emails sent with the Company A address.  I don't think there is anyway to fix that.  I don't think there is anyway for an exchange server to fail over a search to a secondary system.
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
However .... maybe a work around and can test it.

Create a secondary account for UserA in CompanyA with same name and Email address as @CompanyB.com.
Give "Full Mailbox Rights" to UserA on UserA in CompanyB ..... add it in Outlook and see if you can send email to public domain.

- Rancy
Hi, from the situation described by you, what I see here is:

You need to create account or all the Users of the old domain (company B) on the new domain (company A). And then configure the Exchange server (I assume you are using this mail server) to accommodate both these domains for all user accounts:

Once, the Users of Company B are on domain of Company A, you can configure Exchange for dual accounts. Follow this link for setting up Exchange server:


Hope this solves your problem.

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