| A mail proxy is what is needed (I have no idea if these exist today). Put your letter inside an envelope to a mailing proxy. Mailing proxy opens your letter, and sends your recipient a letter from them. There are more opportunities for misdirection - the mailing proxy service can internally shuffle letters around and add mailing delays to discourage external analysis. Although, even with all that, I'm unsure of the effectiveness of this approach. It's usefulness also scales with the number of people willing to use such a service. Does the gov't need a second warrant to open a letter-in-a-letter? Alternatively, you could use a peer-to-peer mailing scheme - advertise your mailing address as a mailing "node". People who want to "use" you send you a letter, and inside that letter they write a letter to the intended recipient, with the sender addressed as you. When you receive such a letter, you merely open the one addressed to you, and drop the inner letter in the mailbox. Nest as many letters as you want and have your letter "hop" around the world. |
Interesting question; I'm guessing no, unless the interior letter contained obviously privileged material (eg 'Dear Father, I hope you are well; enclosed is a letter I received from your lawyer after you departed, which I forward to you unopened. Your Loving Son.'), in which case a warrant would probably not issue for the contents.