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

We have all been doing email address validation for a very long time to make sure that the email is correctly formatted. This is to avoid users entering wrongly formatted email address but still they can accidentally give us a wrong email address.

Example of a correctly formatted email address but still wrong:

mailbox.does.not.exist@reddit.com [VALID email fromat but still not correct]

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