This is Sharon. Here is Seth's address if you want to write to him:
Elder Seth Barrus
2005 North 900 East #49
Provo, UT 84604
Best way to write is to send an email through dear elder.com.
They will print it off and hand deliver it the day you send it if you get it in before noon.
Just use the same information that is in his snail mail address. 0708 is his estimated departure date.
You can email him, but he only has 30 minutes to write emails on PDay, so he said he'd rather have hard copies of letter that he can respond to and use the 30 minutes writing rather than reading. After he gets to Indonesia, then email will be the best way to correspond. (Although, there's still something about getting a real letter when you're out on your mission.)
His email address is: firstname.lastname@example.org