Dearelder.com is a great way to write letters for free through Pouch mail when he is in Argentina! Just go to the page and click on Argentina Mendoza Mission! Thanks for your support! If you send a package send it to this address without putting his name on the ship to address. Put his name and your address as the return address and then he won't have to be present to go pick up the package.
You can send emails to: firstname.lastname@example.org and I will send them on to him!