Contact Form 7 (Stopped working completely)

Been using contact form 7 for months on a single site, recently it just does not work. Configuration & Syntax errors are shown in red on all the contact forms created. Even when removing all text in the supposed error field it still stated syntax error in red.

On the site itself it states the “Sender’s message failed to send” message to any user that correctly fills in and submits a contact form

https://www.ads-software.com/plugins/contact-form-7/