Manual Instructions. “invalid mailbox syntax is used” appears. We will be styling Contact Form 7 forms using CSS. You will also find the Contact Form 7’s default contact form, labeled Contact Form 1. Always remember to add tracking to your contact form in order to monitor which sources of traffic are netting you the most conversions. When using Contact Form 7, you will now have syntax highlighting in all form and email edit textarea’s. Install the plugin from the Plugins menu and then activate it. This tutorial will show you step by step how to resolve some of the Common Contact Form 7 validation / syntax errors. Contact Form 7: Invalid mail box syntax. The code [contact-form-7 404 "Not Found"] is a sign that the contact form specified by the shortcode (described in the previous answer) couldn’t be found. Here’s the syntax you should do in the Contact Form 7 form: https://ibb.co/qpHf6GL. This series of articles explains common mistakes and how to resolve those errors. Contact Form 7 generates a very useful and standard compliant code for the forms. When using Contact Form 7, you will now have syntax highlighting in all form and email edit textarea’s. When using Contact Form 7, you will now have syntax highlighting in all form and email edit textarea’s. roger-webmaster (@roger-webmaster) 1 year, 10 months ago. I am using the Drop down menu, with pipe, to enable users to select their recipient. Contact Form 7 provides Configuration Validator, which validates your contact form configurations to detect errors; this saves you from future troubles that the configuration errors might bring on. Here’s the syntax you’ll have to do in the Contact Form 7’s mail form: https://ibb.co/fqGhqPD. Make sure you are using the correct shortcode. Each element in the form has a proper ID and CSS class associated with it. Contact Form 1 contains all the fields a basic contact form may need. All the CSS goes into your theme or child theme‘s stylesheet. Manual Instructions. Screenshot of a Shortcode of Contact Form 7 My contact form doesn’t appear. Manual Instructions. Support » Plugin: Contact Form 7. How to Install Contact Form 7. or Log in to Create a Topic. You can adjust the textarea height and width using the build-in Contact-Form-7 syntax. You can not put tags like or