This project is no longer maintained and no further public releases are planned.

No further support will be given.

Feel free to fork the git repository.


Checks if a MX record exists for the domain of an email address.

If the user enters an email address like "user@example.tld", Formhandler checks if a valid MX record exists for the domain "example.tld".

This doesn't ensure that the mailbox "user@example.tld" exists, but at least makes sure that there is a mailserver running.

Version added



If your webserver runs on Windows, you need at least PHP 5.3.0 to use this error check.