DNS problems with different domains

We have 3 domains. DOMAIN1.COM, DOMAIN2.COM, DOMAIN3.COM. Domain's 1 and 2 are Active Directory domains each running DNS for their domain. DOMAIN3 is a domain with only an Exchange server named EXCHANGESRV. On the DNS servers in DOMAIN1 & DOMAIN2 I added a host record for EXCHANGESRV. When a client in DOMAIN1 tries to ping EXCHANGESRV it resolves to EXCHANGESRV.DOMAIN1.COM and can ping the server. For clients with static addresses (including DNS) who do not login to any domain try to ping EXCHANGESRV it fails and cannot find host. However, if their DNS server is in DOMAIN1.COM they can sucessfully ping EXCHANGESRV.DOMAIN1.COM.  In Outlook where the server name is specified as the NETBIOS name EXCHANGESRV clients cannot login because it can't resolve EXCHANGESRV.
Some of these static clients are Mac's and some are PC's. Is there a way to have them all resolve EXCHANGESRV without setting them for DHCP as they are on a different subnet and there is no DHCP server available.

Thanks
bhatokAsked:
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Joseph HornseyPresident and JanitorCommented:

Try manually adding a host record for EXCHANGESRV in the domains whose clients can't ping it.

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bhatokAuthor Commented:
I have manually added a host record for EXCHANGESRV in the DNS servers of the clients who can't ping. They still cannot ping EXCHANGESRV, but by adding the record they can then ping EXCHANGESRV.DOMAIN.COM

Since Outlook is looking for EXCHANGESRV, they still cannot access email unless I edit the HOSTS file with the unqualified name EXCHANGESRV and the IP of the server.
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Joseph HornseyPresident and JanitorCommented:

I'm not thinking too clearly... I don't know why this isn't just coming to me, because it's a really simple solution.  How about this... delete the host record and add a CNAME record of EXCHANGESRV and point it to EXCHANGESRV.DOMAIN1.COM (or wherever the Exchange server is).

Actually, I just noticed that you said that the problem is with users who do not log in to a domain.  When the computer is a member of the domain, it automatically appends the domain to the end of a host query (if it's not a query for an FQDN) which is why domain users work okay.  If the computer's not in the domain, try appending the domain name to the end of the connection on those computers.  Go to your Network Connections and then the properties of the Local Area Connection.  Go to the TCP/IP properties and cilck on Advanced.  Go to the DNS tab and there should be a space to add a DNS suffix for the connection.  Put in whichever domain they should be using and give it a whirl.

This is a setting in DHCP, too if you want to automate it.

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bhatokAuthor Commented:
Thanks for your help. I statically added the domain suffix to the PC's who weren't using DHCP and it let Outlook find the server.
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