The other thing to remember is that in a small community—and it's probably the same in Dryden—the folks working in that post office are your friends and neighbours as well. It's not unlike what Drew mentioned. It takes me at least half an hour to go to the post office and pick up a letter.
Evidence of meeting #33 for Government Operations and Estimates in the 42nd Parliament, 1st session. (The original version is on Parliament’s site, as are the minutes.) The winning word was mail.