I'd love to be able to set up a mail system between settlements,(can we get some pen pals going to create more of a community feel to the new commonwealth? maybe a quest to reunite old lovers/family who were separated & have found each other in other settlements?). Let's make use of those postal outfits and hats, pens, pencils, clipboards, etc. Building a central post office (perhaps at Fairline Hill Estates?) & little post offices along the way (or in each settlement) would be a fun DLC, I think.

the postmen will just end up getting shot in the head and forced into a terrible main questline

sounds cool! But first let's just focus on getting the DLC we've already heard about

..yeah and Preston will be the Postmaster General. ..."heres another letter that you need to get to Finch Farms"... OH and I heard of another settler that didnt get their package" I'll mark it on your map.....

I like the idea, not sure how correspondence between player and others would work.

I would eat that up! Ever since seeing the saga of the raider sisters

, that would be pretty sweet. I think the kidnapping radiant settlement quests scratched this itch a little, but something more involved, maybe with new named NPCs, might be fantastic. Like make it a puzzle.

LOLLLLLLL!

You do not mess with postmen! http://www.imdb.com/title/tt0119925/

... God that movie was crap.

Could revive the old saying "going postal" (which was also a great game, well the second one anyways, never played the first)