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2. How to check if an email address exists without sending an email?

   stackoverflow.com/questions/565504

   helo hi 250 Postini says hello back mail from: <[email protected]> 250 Ok rcpt to: <[email protected]> 550-5.1.1 The email account that you tried to reach does not exist. Please try 550-5.1.1 double-checking the recipient's email address for typos or 550-5.1.1 unnecessary spaces.

3. How to check mail address is exists or not? - Stack Overflow

   stackoverflow.com/questions/13514005

   The only way to confirm an email address is to send an email to it and require the user to follow a (unique) link in the email back to your website. Share Improve this answer

4. What is the best way to verify an email address if it actually...

   stackoverflow.com/questions/69412522

   It is the response to RCPT TO that we are interested in. If the server sends back a 250, then that means we are good to send an email (the email address exists), otherwise the server will return a different status code (usually a 550), meaning the email address does not exist on that server. And that's email verification!

5. How to check if an email address is real or valid using PHP

   stackoverflow.com/questions/19261987

   By the way, my upvote is not for the simple validation, which anyone should be doing without thinking about it, but rather for correctly observing that you simply can never rely on server responses to determine email account status, if you could, every spammer in the world would use such a method to validate their email databases to avoid sending to dead emails, which costs them money.

6. how to check if a given email address actually exist in c#?

   stackoverflow.com/questions/3797961

   The only way to check this is to send an email to that address and make sure that you send a link that needs to be clicked to activate the account. There is no other way to check if an email is correct

7. Can I check if an email address exists using .net?

   stackoverflow.com/questions/3883518

   No, it is impossible in principle to check if an email exists - independent of language. There is simply no protocol to do it. There are some partial solutions, but none of them are reliable. See How to check if an email address exists without sending an email? for details.

8. How to check the existence of an email address - Stack Overflow

   stackoverflow.com/questions/60674445

   Validating that an email address is a legal (e.g., mailable) format is one thing, but it doesn't tell you that there's a mailbox at that address. The only way to know if an email address "exists" is to mail something to it. If it [eventually] bounces, you can be pretty sure that it doesn't exist.

9. python: correct method verify if email exists - Stack Overflow

   stackoverflow.com/questions/53561296

   I am trying to verify if an email actually exists by first resolving its dns, then check if the email is valid using the below code: email = test@cisco.com domain = email.split("@")[-1]

10. java - How to check if email actually exists - Stack Overflow

    stackoverflow.com/questions/40666872

    Sending a confirmation email. Ultimately, you should send a confirmation email with a one-time token to the given email address, and store that token in your database for future reference. If the user can click a link in the email sent (ie. can send the token back), he proves that the email address is valid and it actually belongs to him.

11. Check if email exist php - Stack Overflow

    stackoverflow.com/questions/14448649

    3. Send a verification email to the address. This is the most effective way of seeing if someone is at the other end of the email address. If a confirmation email is not responded to in an orderly fashion -- 3 hours for example -- then there is probably some problem with the address.