As a matter of fact, you can. And it’s quite easy. A couple of sites are there for this very purpose. Use your search engine (maybe, StartPage?) to search for those sites. Any good site would do. Just search for verify valid email and a couple of sites would pop up. For the convenience you can use VerifyEmailAddress. This site is great and shows you details, if you need so.
You can verify the validity of a single email address or for bulk email addresses. Verifying single email address is free while for bulk addresses, you can do the verification for a number of email addresses for free. And then you may be asked for pay-to-go. But for single or a couple of email addresses it’s hassle free. So try it now!