Exchange 5.5 can't send to exchange 2003

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We're in the process of migrating from nt4 to server 2003. I have built the
2003 domain (with exchange 2003) and connected both to the same LAN HW. I
also added the DNS servers for both domains as forwarders for DNS queries. I
can send email from the exchange 2003 envirement to the 5.5 but not from the
5.5 to the 2003. I want to get email flowing between the two before
migrating user mail boxes. Thanks for any help.

Randy
.



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