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This email verification tool actually connects to the mail server and checks whether the mailbox exists or not, wipeout disposable email addresses from your email list.

Mass email verification tool.

Email verification and deliverability checker.

Email verification and deliverability tester.

Save time and energy - find the email address formats in use at thousands of companies.

Generate variations of emails of user.

Find email addresses of companies and people by domain name.

Search email, phone by domain name.

theHarvester is a simple to use, yet powerful tool designed to be used during the reconnaissance stage of a red team assessment or penetration test. It performs open source intelligence (OSINT) gather[...]

GHunt (v2) is an offensive Google framework, designed to evolve efficiently. It's currently focused on OSINT, but any use related with Google is possible.