I'm disappointed that people automatically assume missionaries are disobedient and don't give them the benefit of the doubt.
Search this on Google and you'll find tons of missionaries blogs with the exact same wording.
Missionaries are to write to their families each week and are also authorized to communicate by email with friends, priesthood leaders, and new converts. Mission presidents should allow sufficient time on preparation day for missionaries to write emails and letters. While in the mission field, missionaries should receive authorization from the mission president before entering into communication, including via email, with converts and others of the opposite gender within the mission boundaries.
In case you want more proof... from a currently serving Mission President:
http://lovellsinargentina.blogspot.co.u ... olicy.html