How do I add an external e-mail domain to my Windows domain?

We own a domain name (e.g. externaldomain.com) and currently have an e-mail address associated which simply forwards to one of our staff.  There is now a need for this to become a mailbox and the ability to reply to e-mail as the e-mail address (and not as our internal e-mail address).

Is this a case of adding the external domain to our DNS somewhere, or associating it with our internal domain so that it becomes available as an e-mail address i.e. email@externaldomain.com which can be added to a shared mailbox?

How is this done, please?

thanks
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fuzzyfreakAsked:
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SvenIAConnect With a Mentor Commented:
You need to create an MX-record at the domain host first, pointing to your Exchange server.

Then add the domain to Exchange as an accepted domain. This should be an 'external relay domain'. Then create send and receive connectors for your domain, and email address policies.

Some websites to get you started;

http://www.petri.co.il/configure-exchange-2007-recieve-email-other-domains.htm#

How to Create an E-Mail Address Policy

http://technet.microsoft.com/en-us/library/bb124401(EXCHG.80).aspx

Configure Specific E-Mail Addresses for Specific Exchange 2007 Recipients

http://www.petri.co.il/configure-specific-email-addresses-exchange-2007-recipients.htm
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suriyaehnopCommented:
Addtional to SvenIA, i think the new accepted shall be "internal relay domain"
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Md. MojahidCommented:
First of all you need a public ip and then you have to create some request on DNS like Mx  and also create same create on your local dns.

Then create send connector on exchange.
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fuzzyfreakAuthor Commented:
Thanks, i am still working on this.
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