Let me trytry this
http://download.cnet.com/Email-Extractor/3000-2650_4-10527464.html
try this
http://download.cnet.com/Email-Extractor/3000-2650_4-10527464.html
you can read that text file using java or php or ruby or any programming language after that make a regex pattern for emails. Make a for loop to compare every word with regex pattern and store matched pattern in a container. You are done.