I just ran across a very strange behavior that I figured I'd better blog about, in case it might help someone else. I'm not yet sure what the problem is, but I found the solution.
I was configuring a machine for demonstration purposes that had Outlook 2007 running on a Windows Server 2008 domain controller/DNS server (again this was just for demo purposes) that has an SMTP server running on it. Outlook would not connect to POP3, SMTP or IMAP when I used the DNS name of the server. I had to use the IP address. This is despite the fact that DNS is configured perfectly and there are no other IP or DNS related problems on the machine. Again, I'm not sure why this is happening, but the fix was just to configure the mail account in Outlook with an IP address.
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About danholme
A graduate of Yale University and Thunderbird, Dan has spent over a decade as a consultant and trainer, delivering solutions to tens of thousands of IT professionals from the most prestigious organizations and corporations around the world. He has recently supported Microsoft technologies design and implementation at enterprises such as Raytheon, ABN AMRO, Johnson & Johnson, and General Electric. He was also the Windows Technologies Consultant for NBC during the Torino Winter Olympics, and is helping NBC to prepare for the Beijing games in 2008.
Dan’s company, Intelliem, specializes in boosting the productivity of IT professionals and end users by creating advanced, customized solutions that integrate clients’ specific design and configuration into productivity-focused training and knowledge management services.
Dan is also a contributing editor for Windows IT Pro magazine, a Microsoft MVP (Windows Server & Directory Services) and is currently penning his third book, to be released later this year by Microsoft Press.