Improves email validation in the following ways:
More extensive typo detection
Checks the domain-part of an email is "valid" and can receive email (ie has an MX/A record), and then checks any MX records are not listed in the banned email domain list
This validation is done via the bundled...
This really simple Add-on checks if the domain-part of an email is "valid", eg. if the domain can be found via DNS - if not the email address is rejected as invalid.
Validation is done via the bundled version of https://github.com/egulias/EmailValidator