Of course you can ping and telnet to the server using the IP, that's not the problem but DNS resolution is. Post the details of your /etc/hosts file I can't answer about sbcglobal.net.mydomain.com as I don't know what the address/domain name is that you're trying to send it to. Have you done any 'dig' commands to see if your domain name & A/MX records resolve correctly?
Is this PC connected directly to the internet or behind a firewall (apart from the one on the server)? Which O/S is this on? Is this a NE or OSS Zimbra server? Have you disabled any SELinux (if that's on your system)?
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Regards
Bill
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