What is the fastest and most reliable way to send mail to Mexico? I mailed a letter to the capital of a state at the end of April and it never arrived, but I mailed it regular US airmail.
I've heard DHL and Fedex are the best way to go, but what if I am just sending letters and although it would be of sentimental value, it's not that big of a deal if it gets lost? Is there a special method with US Mail (like Express with Delivery Confirmation or Return Receipt?) that I could use where it's between $15 to $20 and very reliable?
