The Simple PHP Contact Mailer works by getting a POST request from the contact form in the contact.html file and then try to figure out if the data is SPAM and then send it along to you via email.

The steps to verify if it is SPAM or not are the following:

1. See if reCaptcha accepts the request.
2. See if the IP address has made a request within the threshold.
3. Sanitise the data a bit.
4. Send the email to you.

1. Make sure that you have a web server with support for PHP and its mail component.
2. Set up reCaptcha v2 and copy the corresponding keys into mailer.php and contact.html
3. Change the settings at the top of the mailer.php file to suite your needs.
4. Upload the mailer.php, contact.html, error_page.html, filter.sqlite and confirmation_page.html to the root of your server, all in the same folder.
5. Browse to the contact.html file on your server, like example.com/contact.html for example.

The database file is created with the following statement:

CREATE TABLE `messages` (
    `id`    INTEGER,
    `email` TEXT,
    `name`  TEXT,
    `message`   TEXT,
    `created`   INTEGER,
    PRIMARY KEY(id)
);

CREATE TABLE "spam_fltr" (
    `id`    INTEGER,
    `ip_address`    TEXT(45) UNIQUE,
    `created`   INTEGER,
    PRIMARY KEY(id)
);