Accessing WAN domain name within my LAN

Hmmm, I'm not sure if that Subject was very helpful.
I have a home LAN with several computers, including a laptop that goes with me to work. My desktop hosts a number of services (IMAP, SSH, HTTP, etc). I use dyndns.org to point to my home LAN, and my router uses port forwarding to point those services to the desktop.
When I'm in my LAN, I reach my desktop by using its local IP address (i.e., 192.168....); when I'm outside my LAN, I reach the desktop using the domain name.
Since I use my laptop at home and on the road, I need to do annoying things like change Mail.app's server settings everytime I change location.
Surely there's a better way. Any suggestions?

I didn't catch what OS the desktop system is running, but configuring bind/named is pretty well documented and not a major task. In my opinion, you're just front-loading all the work at one time rather than messing around with changing your mail application settings.
If you decided to go that route later, search for "caching name server" and set that up. Then simply add a zone file for the domain you're looking to override on the local network and you're pretty much done.
I don't know how you retrieve your mail, but if IMAP is an option, you might want to consider using separate mail programs and use IMAP as the method in which you retrieve mail. IMAP assures the clients will be in sync, and you simply configure Mail for one location and another mail client, like Thunderbird or Entourage, for another location. Kludgy, inelegant, but it works because I've used that solution myself. If IMAP isn't available, you can probably get by with POP3 and tell the mail clients to leave the mail on the server. Mail and Thunderbird do a fair job of keeping things sync'd, although IMAP is much more preferable.

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