Cannot remove domain in Exchange Server

I cannot remove a domain from Exchange server.  I have a company who, let's say, run existingcompany.com as their main e-mail domain.  They then decided they wanted to receive e-mails as newcompany.com (although not to send as that domain).  I therefore added an entry under 'Recipient policies' for a new SMTP address to be applied to all users, and modified the MX records for newcompany.com.  That all worked.

They now want to spin off newcompany.com onto a separate server, so I changed the default policy back to its old setting, and deleted all the 'newcompany.com' addresses manually from each user in SBS, and ran a gpupdate /force from the command line.  However, I still cannot send e-mails internally to newcompany.com.  They should exit the server, and go out to the Internet, but they just bounce back with 'undeliverable'.  Is there something I'm neglecting to do?
TechdivisionAsked:
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Stephen CroftConnect With a Mentor Technical ArchitectCommented:
Why did you have to manually delete the email out of all users?

Have you removed the newcompany.com email address from your Recipient policy?

Have you tried creating a connector for newcompany.com with an cost of 1, see if that routes?
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TechdivisionAuthor Commented:
Thanks for getting back to me so quickly...

I didn't have to manually delete the e-mail, I just did it because doing the gpupdate and 'apply policy now' settings didn't remove any of the e-mail addresses.

I have removed the newcompany.com e-mail address from Recipient Policy.

I haven't created a new connector yet; I would prefer just to wipe the e-mail server back to how it was before, i.e. with no knowledge of newcompany.com
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TechdivisionAuthor Commented:
Found it - The solution in the end was to restart the Exchange System Manager Service, after having updated the Recipient Policy.  Simple as that!  Thanks for your help.  Mark
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