It may be he feels uncomfortable emailing someone of the opposite sex. There are some people who totally avoid doing so.
Unless he said to specifically email him about helping out. If so, it would be very courteous to respond, but not everyone is
always that way. They don't mean to be rude, they just don't get around to corresponding.
He may also make a mental note of it, and talk to you next time he sees you in church.
Sooner or later, you'll find out!
Irene (away from the convert board, time to go back before I get caught, haha)