

The plugin page under Tools: the daily result per form, the code field and the CAPTCHA exception.
A contact form can stop delivering email without anyone noticing. The visitor sees a thank-you message, but the enquiry never reaches your mailbox. Often it takes weeks before a customer calls to ask why nobody replied.
Contactformchecker fills in your real contact form every day with a unique code and checks that the email actually arrives in your inbox. If it does not arrive within about two hours, you receive an alert with the likely cause.
This plugin is the companion for your WordPress site. It does two things:
The plugin adds nothing to the front of your website. It sets no cookies, does not track visitors, and changes nothing for the people who fill in your form.
Your website and Contactformchecker share a secret key that is created on your own site. Every daily test is signed with it. A signature is valid for ten minutes, only for your domain, only for your own codes, and only once. Anything without a valid signature meets your CAPTCHA exactly as before, so nothing is opened up for spammers. The technical details are in the FAQ below.
The plugin is free, but it works together with a Contactformchecker subscription: €10 per form per month, cancellable monthly, or €100 per form per year, with a 14-day money-back guarantee. Without a subscription code the plugin has nothing to show and nothing to do. The plugin page has a button to the sign-up page on contactformchecker.com, where you choose the page with your form and pay through Stripe.
This plugin connects to the Contactformchecker service at contactformchecker.com, run by Elmar Teeuwen. Nothing is sent when the plugin is activated. Data is only sent after a logged-in administrator saves a code.