Neverbounce is one of the biggest players in the email list verification space
Surprisingly, they're far from the most expensive in the field, while they have one of the best looking sites, and intergrate with over eightly different email platforms (which is a ton, honestly.)
Besides the standard fare of doing bulk list verifications and individual email address checks, Neverbounce can connect to your email service provider and then check your lists regularly, which is a pretty interesting idea. So if you use Klaviyo, for example, it can check daily and remove any emails that would no longer work. And since a lot of email services have pricing based on how large your list is, cutting the crap out can help financially, plus not sending to dead email inboxes can help your deliverability and everyone who uses that email service.
