question End user emails...

[iDat]

Hunter.io says CEO's email is valid but services like mailtester.com and others says wrong email and false. Is hunter.io correct?

Snov.io cannot find email address. RocketReach showed a verified email address but mailtester.com says false.

How to determine correct email format? What to do?

 

[iDat]

Anyone?

 

[TribeMagnet]

It is unclear what you are asking about. Email formats are [email protected].

Not sure how the general public is supposed to know the specific email address of an unspecified CEO?