Outbound emails problem please help

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We are in process of migrating from 5.5 to Exchange 2003. Right now we have
introduced a Exchange 2003 server to host email boxes, OWA server and one
Exchange 2003 box for SMTP. We are still in a Mixed Mode. We have tested new
exchange with few mail box transfer to new Exchange 2003 server and its
working fine.
Problm is with new Exchange 2003 SMTP box. If I shut down old 5.5 SMTP
server I can receive emails through new Exchange 2003 SMTPbox but I am not
able to SEND emails out. When I trun on the Old 5.5 SMTP server I can see all
the outboud email in Queue and its send emails after some time. I have
created MX records with ISP and within our DNS server also. I have opend Port
25 in Firewall. Can some give me some hint what should I check.

Another issue is that we have to host emails for another domain also in the
same exchange server. Our mail domain is 'company1.com. We want to host
emails for another domain 'company2.com also but only for few users. I think
in Mixed mode on Default Recepient Polcy works? Is there any way to configure
this in Mixed mode that we can host this domain emails for few selected users
only.
Exchange2003Sp1 is running on Windows 2003 SP1

Thanks in advance for your help
.

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