The Validator checks email addresses over a series of levels to a level specified by the user. If the validation fails at any step along the way, it stops and reports an error. In brief, the levels are:
. The address is formatted correctly.
. Check for known bad email addresses
. Check for known good email addresses
. Check for addresses with domains that confirm all addresses
. Check for mail exchange servers (MX records) associated with the email address
. Attempt to connect to these mail servers
. Query these servers for the existence of the email address’s mailbox Back to Top