lists the addresses of many egyptologists, and some of them have email addresses attached - most of which are for academic institutes so looking at any University in your area that teaches subjects on Ancient Egypt would be the best way to get in touch. However, I do not suggest that you email them out of the blue with an insignificant question. Many of the people listed have their own specialised areas and most of them would not reply unless it is from someone who is conducting scientific research.
If you really want to speak to someone in the know there are plenty of options. The most obvious would be to enroll in a course of some sort and then you will have a lecturer who is obliged to speak to you.
Secondly there are literally hundreds of seminars every year on many aspects of Ancient Egypt (buying the Ancient Egypt magazine will give you a list of these on a bi-monthly basis) and these provide one or two speakers on a specific topic with a chance for discussion afterwards.
The most obvious way to get a question answered is to do a little research, either on the internet or in the library. It's highly likely that any questions you want to ask have already been answered by those who have the funding and the know how.