which one is the best email verifier and why

Would it ever be possible to build an in-house email validator inside mailwizz?
...probably you could use the above script as posted...
...but for sign-up forms there is probably no way - not on one's own server and not via an api service - to overcome the time-consuming grey-listing responses...
 
Which one is the best email verifier and why?
EmailListVerify
or
BulkEmailChecker
or
KickBox
?

I would like to throw VeriAS into the mix on that one. I would be happy to do an A-B test next to any one of those services for anyone interested.
 
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