External Postmaster Address

How can I change the external postmaster address? I have recently changed company names and everything internal as far as addresses reflect the new name. However when DS's are received by a internet recipient, the old posmaster address is showing. I have found the account responsible for the postmaster@etc and added the new domain.  However this does not affect messages sent from the internet.
csmith2compmailAsked:
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SteveH_UKCommented:
See http://technet.microsoft.com/en-us/library/aa997037.aspx for information about the postmaster mailbox.

If you have a particular account already used for the purpose, then make sure the new domain is set as the default SMTP address on the E-mail addresses tab in AD Users & Computers.
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SteveH_UKCommented:
To set the default domain for the postmaster, you need to make sure that the primary address in the Default Recipient Policy (in ESM) is in the new domain.
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