We just found out that he is allowed to receive emails from friends as well as family on his missionary email. We were under the impression it was for immediate family and bishop/stake presidents. Thankfully, our misconception has been corrected! Feel free to write directly to Vanhin Milligan at:
He is able to read and reply to emails on Thursdays while in the MTC. Email him before Thursday to guarantee he will see it no matter when he gets to log on!
Or you can write him the old-fashioned way, which he can read ANY DAY OF THE WEEK!, at:
Elder David Scott Milligan
2009 N 900 E Unit 135
Provo UT 84602
Flood him with letters please! He has hit the "I'm getting homesick" phase!