How to check if an email exists?

Question

Email

Good afternoon.
Is it possible to somehow check if an email address exists (except for checking for a valid spelling of the address)
Thank you

Answer 1

Certainly not possible.
Considering how much spam there is now, many mailers may not even return an error, or return it only to trusted servers.
And so - just send a letter.

Answer 2

ftp://ftp.rfc-editor.org/in-notes/rfc821.txt
VRFY
But this is not a required protocol command.

Answer 3

https://github.com/hbattat/verifyEmail

Is a PHP class that can be easily used to verify an email address and make sure it is valid and does exist on the mail server.
Some mail servers will silently reject the test message, to prevent spammers from checking against their users' emails and filter the valid emails, so this function might not work properly with all mail servers.
You server must be configured properly as a mail server to avoid being blocked or blacklisted. This includes things like SSL, SPF records, Domain Keys, DMARC records, etc.

How to check email for existence?
How to check if an email exists before sending an email?

Answer 4

https://2ip.ru/mail-checker

Answer 5

mailify.com