Free Bulk Email Checker Tutorial
Checking to see if Spee.ch has your asset locally...
Bulk Email Checker Tutorial - How I use a bulk email checker when I do email marketing. It's a little bit of a process but well worth the time in my opinion.
Try NeverBounce - This is what I use now: https://neverbounce.com/?tap_a=5284-214487&tap_s=234707-c52361
Link to Email Validator Tool: http://e-mailvalidator.com/