Would be great to have a fully functional INHOUSE Email Verification to scrub lists similar to Reoon (on AppSumo) as well as an "API Settings" where you can integrate the Email Verification into website and forms, so at the very moment someone is filling a form the email is verified in under .5 seconds so the emails will be valid upon first interaction...
That is something I am planning to definitely use in website, forms, surveys, webinar registrations.
The Benefits and case use is exponential as we can then market the ability to scrub and reactivate lists, lower bounce rates, bad emails, temp emails, etc. and only send to VALID live emails, whilst protecting both our and clients email/domain reputations.