As Skeeve said, search is your friend. There's plenty of content on this site that you can search on before posting that would most likely give you plenty of info to go off on your own with a solution.

As davorg said, i think the general consensus is Email::Valid for email validation. Whenever dealing with emails, check the Email namespace on CPAN. They're working very hard to standardize and create efficient ways of validating and manipulating email addresses.