Скачать или смотреть How to Verify Email Address Online | Check Email Address 2018

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You will find many site/ tools like them:
http://mailtester.com/testmail.php
https://tools.verifyemailaddress.io/
https://email-checker.net/check
Hunter.io
For Hunter.io you have to sign up for business email and you can verify 100 email per month.Verify Email:

If you have a list of emails for sending email for marketing purpose or personal communication and you want to connect with them you have to ensure first that the email address is verified and they are able to receive your email.
What will happen if you send email to unverified email?
The email will bounce back to you.
Failed to send the email.
You can’t reach your targeted person.
So, It's Important to check email validity.