I can't say that I know much about The Postmarks, other than that the lead singer has a beautiful voice, and that I like listening to them. You can find more information about this Florida based band here. You can also listen to more songs on their MySpace. Maybe the Postal Service will do a remix! HAHAHA! Anyway...here are some MP3s...
MP3: The Postmarks - Goodbye
MP3: The Postmarks - Know Which Way The Wind Blows
Website
This is like a Margo Guryan tribute band. I mean that in a good way.