Question

to find out about email address of one of your friends, which utility will you use and how?

Answer 1

At present, I am using the following software and I am very much satisfied :
 
1.  Rapportive - If you enter a person’s valid email address, the side of the      email will show the person’s social networks, general location, etc

2. Email Hunter - With this you can find the Email addresses in bulk.


Hope this helps!