It has become very tough to mail a letter nowadays, even when local delivery is expected. The Post offices have degraded to such an extent they now routinely throw 'undeliverable' and 'return to sender' stickers on a massive ratio of letters. It does not matter what state you are in and what number of letters you are emailing. However, Above all, the Post offices are now a friend of small business and the common people. In reality, if you desire to mail something to anywhere, just fell free to use the Post offices.
Things To Do At The Post Office
The Benefits of Having A PO Box For Your Business