They should, other than the weirdos up at MSU-COM... 😉 kidding.
What Interfolio does is scan your LORs into their system and hold them. When you request they send a copy (a color one I presume) to whomever you designate. All you have to do if they are not in the Interfolio database is type in the address exactly as you want it put on the envelope. Some of the allopathic schools are linked up with Interfolio and you can electronically send the LORs so they get there uber fast, but otherwise you can choose from a few different postage options. Its really quite handy actually and I wish I would have known about it before I started asking for letters to go to different schools.