How to change Sender ID on Exchange 2007?

We recently changed our company name, and while we didn't yet change our domain, or migrate Exchange, our Exchange server is sending out emails from new email addresses associated with a new domain name.

Emails sent out from the server still have the server.olddomain.com stamp in the message ID field, which cause the emails to be dropped at the receiving end if they have Sender ID Filtering or other kind of SPF enabled.

How can I make Exchange stamp all emails with server.newdomain.com?
CEAdminAsked:
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endital1097Connect With a Mentor Commented:
you need to update the send and receive connector fqdn
properties for the connector
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Alan HardistyConnect With a Mentor Co-OwnerCommented:
Once you have changed your Send Connector FQDN, call your ISP and ask them to also change your Reverse DNS record on your fixed IP address otherwise that will still show your old domain name too.
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CEAdminAuthor Commented:
I distributed the points 50/50 because Alan pointed out extra items that would also need attention regarding this matter, even though he was not the first to reply. Thanks for the answers.
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