You can start sending letters to the Philippines for Elder Sarmiento to receive once he arrives there.
Elder James Thomas Sarmiento
Philippines San Pablo Mission
Barangay San Juan, Alaminos
You can also send him letters for free through dearelder.com, these letters are printed up and placed in envelopes as sent to either the MTC or Philippines as letters. While in the MTC if you do this before 4pm PST he will receive it the same day. If you are sending to the Philippines I think it may take at least 2 weeks.
Instructions for dearelder.com:
Log Onto www.dearelder.com
Select from the drop down menu: either Provo MTC or Philippines San Pablo
Then Select from the drop down menu: Write Letter
Information is just like addressing an envelope, at the MTC his Unit# is 15 and the Mission Code is just Philippines San Pablo
He loves hearing from everyone, thank you to those who have sent packages and letters.