Do you verify your email lists?

Hey everyone !

It is known that email marketing provides one of the highest ROI's in the digital marketing world. With that being said, your bounce rate & domain reputation are very important when sending out large amounts of emails.

My question is, do you guys verify your email lists? If so, who is your favorite service provider & why? Also, are there any extra features you wish they had?

I have been putting a lot of time into building an email verification software along with a chrome extension to be able to conveniently access the service. I am just wondering if this is something to continue investing time into !

Thanks in advance.