About

Email validation :

• address
• and reputation

Structure

See the section-3.4 - Address specification of the Internet Message Format specification

Fake email

Most bots:

• use email addresses that
  • have a lot of numbers
  • have more than one dot
  • ends up with .ru, .cz and/or .pl domain
  • have no website or a parked website
• subscribe multiple time with different user from the same domain

Third party provider

valid email addresses against fake sign-ups or old addresses

• BriteVerify
• DataValidation.

Library

• Js: https://github.com/mailcheck/mailcheck