I usually try to reply to my emails  within 48 hours.

If your message remains unanswered after 2 days, please check your spam folder and make sure that my address figures in your white list. 

This should solve the problem, but if not, please let me know by sending me a message through my Facebook profile.  You do not need to be a registered user to do so.   

Simply click on the "Send a message" button at top right, once in my profile.  I don't accept friendship requests from people I don't know personally, but I will reply to messages.