extracting information

Greetings!  

What I would like to do is capture the last segment of everything after
the @ in the from line.  i.e., 

x(_at_)y(_dot_)com
x(_at_)a(_dot_)y(_dot_)com
x(_at_)a(_dot_)b(_dot_)y(_dot_)com

I would want to get y.com.  

-- 
A closed mouth gathers no foot.