If you are planning to more or less auction some 
of the cels anyway, why not put them on the free 
animanga auctions?  Also, if your e-mail does not 
work, why not temporarily set up a hotmail 
account?  It's a free service and is pretty 
stable - (obviously there are other free e-mail 
services out there too).  If you are getting 
swamped, you might ask some of the professional 
dealers how they handle it, they seem able to 
process close to a hundred e-mails/orders in just 
a few days.

Hope this helps!