By enablinig this plugin, it prevents double clicks when Contact Form 7 is still submitting the form that causing the multiple same submissions coming through.
For Contact Form 7 version 4.9 or above.
- Download this plugin thru this repository - click "Clone or download" drop down then click "Download ZIP" and save it.
- Within your WordPress dashboard navigate to Plugins -> Add New then click "Upload Plugin" then choose the zip file that downloaded previously.
- Click "Install Now".
- Once plugin installed, activate it thru Plugins page within your Dashboard.