Hi My SBS 2003 R2 server is configured as a domain controller with the domain "mydomain.com". Got 2 NICS one External one Internal .Internal got static Ip 192.168.0.1 and External got Ip fro DHCP server from ISP.DNS servers for External Nic is 192.168.0.1 and ISP DNS server. Acting as a DHCP server for the internal customers with the internal IP address 192.168.0.1. Acting as an Exchange server with the domain "mydomain.com" but no email been moved to it because our ISP has no static ip's for us. Act as a DNS server 192.168.0.1 and resolve all of the clients requests for name resolution from the local network. People can surf the net and everything work well. Here is my question: We got all of the emails outside of the office somewhere on another email server. To access it through the outlook we use POP3 and SMTP servers as "mail.mydomain.com". After enabling DNS server for domain everything works but this, cant login and saying that pass or username is not valid. I tried to setup the same record for Microsoft outlook off site from another server that does not run DNS server on it and it works fine. I know that I need to add a record to DNS server mydomain.com tree, Mx record, and a host record with corresponding IP for the server "mail.mydomain.com".Updating and still no result. If anyone can help? P.S. We are not hosting a website as well so www.mydomain.com after I enabled DNS was returning an error, I created a host record in DNS with the IP address for the website and it works fine.

have you configured the user to connect and access that domain. I would try and mess with the users and groups in your domains, and make sure that you have an account that will allow you to work between domains. There alow may be a directory error, did you sett up both computers? If so did you add the computer as a child domain? just some thoughts don't really have many anwsers