company merger exchange question

hi, we are in process of another merger  and I have to get a single dns domain name working as email address for both parties  no trust yet  whats the best way

done it before with contacts  and forwarding mail on to the other domain but a bbit messy and better ideas?

both sites exchange 2003.

recap

user@companya.com     user@companyb.com   we would like every one to use   user@companyc.com on our exchange org    
mhamerAsked:
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fishadrConnect With a Mentor Commented:
This is very straight forward and you need to share the e-mail over two different e-mail  systems and the full instructions are here:

http://support.microsoft.com/kb/321721

Basically, one e-mail system is configured to accept the e-mail for the new domain and this e-mail domain is configured as non authoritative (so that it is not the last hop in the domain). You then create a connector to the other e-mail domain and pass any e-mails that are not in the first domain to the other domain. You configure the second e-mail domain to send all e-mails through to the first.

It is pretty stright forward to implement.
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mhamerAuthor Commented:
companyb.com already have the domain companyc.com  so all fine for them

how does companya.com "mail from" companyc.com
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fishadrCommented:
How are you getting on with this - do you need any more assistance?
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mhamerAuthor Commented:
yes sorry  its all done and dusted per your suggestion

thank you
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