- validate syntax
- check for valid domain name
- check mailbox exist for that domain or not
Most of the sites only validate only syntax, but there are the possibilities to have valid syntax but the domain name mentioned in the email is not exist at all. so this is next step to verify domain name
As we move further lets assume some one given email id which is syntactically valid as well as domain name is also valid, but that mail box user mansion is not valid, so for that we will check for mailbox existence.
As we follow these three part of email validation 98% we'll be sure we'll not have any invalid email ids.
Referance:
PHPClasses Advance email validation (for first two step of validation)
Validate Mailbox (for last step of validation)
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