adding second exchange 2003 to network

I started out with one exchange 2003 server(A) and now I just added a second exchange 2003 server(B)  to our environment. Both servers are up and running. I want to move all mailboxes from Server A to Server B. I can't decommission server A until all mailbox and public folders are moved. What I am having problem is user in Server A can't send to Server B and visa verse. Both servers can send email to the outside world. How to I make this work until all mailboxes are moved out, to ServerB?

thanks
officertangoAsked:
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SurajCommented:
Check if you are able to resolve the FQDN of one server to the other.
check if you are able to ping /telnet using fqdn.
Please tell the authentication settings on default smtp virtual servers.

Thanks
Sam
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SurajCommented:
Do you have any smarthost listed on the default smtp virtual server? if yes - remove it.

Are both server in one routing group? or different?
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officertangoAuthor Commented:
na
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