You own it? U lucky dog!
A lot of people still use "e-mail" with the hyphen, though it has been slowly trumped by "email" over the years. Nevertheless, the name still has exceptional value and I would be interested to know how you plan on marketing the name--or perhaps you plan on developing yourself? Or maybe you are just going to use it drive traffic as you are doing now?
Very difficult to give a dollar amount since there is little precedent with .co.in sales. I can write that I would set your lowball price to $2,000, and you can probably get much more if you have the luxury of holding-out.
As always, IMO.
AmCy