Trying to send as with an external account in our domain

We have someone that has requested the ability to send e-mail in there current domain as an external domain. For example, I have an exchange mailbox in xyz.com. I have a recipient policy that allows me to recieve e-mail in xyz.com as abc.com. I now want to send mail as abc.com. ABC.com is an external e-mail source.Is there any way to do this?
StarfishTechAsked:
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2388Commented:
Normally in the properties of the users acount in AD, once you have added the smtp address of abc.com so that the email can be received, you can make that address the "set as primary".  Then all mail going out will look like it is coming from abc.com.  If you don't have dns control of the domain, however, some mail systems might flag it as spam by doing a reverse lookup.
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Exchange_GeekCommented:
":  We have someone that has requested the ability to send e-mail in there current domain as an external domain. For example, I have an exchange mailbox in xyz.com. I have a recipient policy that allows me to recieve e-mail in xyz.com as abc.com. I now want to send mail as abc.com. ABC.com is an external e-mail source.Is there any way to do this? "

Sorry i am a bit confused (though i would love to help) and want the confusion cleared before i can provide you a step towards resolution

Q1) Is xyz.com a Active Directory domain or Exchange Recipient Policy - this would mean do users receive emails @xyz.com ??

Q2) You mentioned "I have a recipient policy that allows me to recieve e-mail in xyz.com as abc.com" - does this mean that the Exchange organization is responsible to receive emails check box checked and also users are stamped with @abc.com as their SMTP address ??

Q3) You mentioned "I now want to send mail as abc.com. ABC.com is an external e-mail source" - this is where the confusion begins - ideally if the above statement 2 is correct (of what i understood) - this means that ABC is not external domain (I am talking not in terms of Active Directory, however purely Exchange SMTP Address)

Q4) Are we talking about a mail-enabled contact who is stamped with @abc.com or a mailbox??

Please do answer these and we would have a solution in hand.
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StarfishTechAuthor Commented:
Thanks for the response Hopefully I can clear up some confusion.
1. xyz.com is and active directory domain. It is also the users primary smtp address.
2. The client bought a secondary domain with an external mx record abc.com. When you go to there website and send an e-mail to abc.com, users in xyz.com recieve the e-mails thru a distribution group in distribution group in xyz.com. Yes, users are stamped with an smtp address user@abc.com.
3. The user wants to be able to send a piece of mail and in the from field put user@abc.com instead of using the user@xyz.com. When I do this currently, I get an error that states I do not have right to send as abc.com.
I do not have any mail enabled contacts setup. The mailbox is stamped as @abc.com
Hopefully this gives you a better idea.
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2388Commented:
Is there a reason why you can't host both domains on your exchange server?
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Exchange_GeekCommented:
@Starfish: Thanks alot for this immediate response.

So what i understand if you go to the user's properties - email address tab - you would find two email address SMTP: user1@xyz.com
smtp: user1@abc.om
X400: blah blah.

Can you verify for me please.
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StarfishTechAuthor Commented:
Yes that is correct. The e-mail address tab has user1@xyz.com and this is there primary smtp address. and another user1@abc.com as another smtp address.
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Exchange_GeekCommented:
Please reverse this and you would be able to send emails using @abc.com as reply options using Outlook.

Or you may want to read this

http://www.amset.info/exchange/twodomainsoneuser.asp
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2388Commented:
I believe that was my solution in the first response!!
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StarfishTechAuthor Commented:
This has worked in the past. The client did not want to go this route. Thanks for the answer.
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