Mail Service Sucks!

So a lot of people received our invites really quickly-- I was impressed when people got them like a day or 2 after we mailed them. However, we are just NOW getting ones returned to us in the mail where the address was wrong. Don't they look at it, realize it's wrong, and just send it back? What have they been doing with these invites for the last month?!?!?! Now it's 2 weeks before the wedding and we are finding this out. GRRRRRRRRRRRRRR. I wish they'd just get rid of the mail and all post offices-- just seem more useless than anything. 99% of what they deliver is junk mail we don't need anyways. Ok, time to stop thinking about the annoying post office!