Updated 09 October 2018 by Max
Direct Access To All The Web’s Email Addresses. Review
First, we verify the format of the email address is correct and looks something like “firstname.lastname@example.org”.
Gibberish email address
We check if the address doesn’t look like a random email address. For example, email@example.com doesn’t pass the test.
Disposable email address
We check if the email address has a domain name used for temporary email addresses.
Webmail email addresses
We verify if the email address uses a webmail like Gmail or Yahoo.
Presence of MX records
We check if there are MX records on the domain. If there aren’t, the email address can’t receive emails.
Presence of SMTP server
This check is successful if we are able to connect to the SMTP server (indicated in MX records).
We test the email address and see if it bounces or not.
We check if the server has a catch-all policy which accepts all the email addresses.