The simplest way to verify the validity of an email address is to send a test email. If the email hard bounces, i.e. there will be no further attempt to deliver a message, the recipient does not exist.26 Nov 2019
How do I validate email address format?
A valid email address consists of an email prefix and an email domain, both in acceptable formats. The prefix appears to the left of the @ symbol. The domain appears to the right of the @ symbol. For example, in the address example@mail.com, "example" is the email prefix, and "mail.com" is the email domain.
Is there a way to verify an email address?
The simplest way to verify the validity of an email address is to send a test email. If the email hard bounces, i.e. there will be no further attempt to deliver a message, the recipient does not exist. Fortunately, you don't have to go this way to verify each email address from your mail list.26 Nov 2019