Another solution recommends using a text match pattern.
This works, but as long as you've got mail.jar in your classpath anyway, you might as well use this technique instead. (Plus, I think it works with older JDK 1.2+, whereas pattern.compile is 1.4+)

Note that it also accepts a comma-separated list of emails, just like a To: or CC: address line would.

This is a simple function to check if an email is valid or not.

Send a Mail using Lotus Notes

Just a simple check to make sure that a person's email address matches their domain.

For example .. in a form you have 2 textboxs .. 1 for their website url, the other for their email address. This checks to see if the domains for the email address and the website url match.

Simple function to check for a valid email address. Makes sure the @ and a . are in the right place. There is most likely a perl package on CPAN that would be more extensive, but this happens to work for my uses.

This script allows the creation of an Outlook Distribution List from a text file. This is handy for creating a quick email distribution list without having to manually add each contact to the list.

I have used it only a couple times, but was born out of a need from a listserv member - they use it almost daily for emailing contacts pulled from a terminal-windowed application and saved as standard output.

Maybe you'll find this useful, maybe not, but thought I'd share it...

Retrieve, delete, view count of pop3 email.

Please download the pop3 class file here first:
http://www.fileden.com/files/2006/10/24/314941/pop3.class.inc

Many uses!!!!