Is there a way? Yes. Is there a way for you? Not without a lot of effort.
Originally Posted by Batgirl Beyond
Spammers validate email addresses by embedding a beacon in the body of the email. If the email ever opens, the beacon is rendered by the email recipient and activates, sending a signal back to the email originator, essentiall validating the email address.
If you really were in no-holds-barred-firing-on-all-cylinders stalker mode, you could create a dummy email address and craft an email about a topic that he would be receptive to based on what you know about him (i.e. if he's in to video games, offer a free vg download) to coax him into clicking through to a web site that you have created. In reality, the page is blank save for a counter that tracks unique IPs. If the counter ever goes up by one, that means he opened the email and clicked through, validating his email address.
Who are you going to believe, me or your own eyes?