Mailbox Creation Exchange 2010

I have an AD forest in my company with a sub domain. Top level domain is "aaa.com". The sub domain is "sss.aaa.com".

Our exchange keeps the mailboxes for both domains. The email addresses are below.
user@aaa.com
user@sss.com

i have added "aaa.com" & "sss.com" as accepted domains in our exchange but the problem is every time I create an user mailbox SMTP address comes only as "user@aaa.com".

I would like to know how to get all the SMTP addresses in the mailbox in relation to the accepted domains I have configured in the Exchange Server.

Hope I have made myself clear here.

Expert help is much appreciated.
Sajith SilvaAsked:
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Elmar KoschkaSenior System EngineerCommented:
In EMC you can create a rule (email adresspolicy). See Attachement.
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Miguel Angel Perez MuñozCommented:
Adding a note: only one of this email address can be principal and outgoing email address. Principal mail address is the address appearing as user´s mail address, can receive from other directions but outgoing mail appears send as principal address.
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Elmar KoschkaSenior System EngineerCommented:
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MASEE Solution Guide - Technical Dept HeadCommented:
Here you go
http://technet.microsoft.com/en-us/library/bb124580.aspx

Just update the current email address policy. as shown above
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