No one is able to submit forms, I took a look at it and I’m getting a POST 500 Internal Server Error.
POST http://carlsbad4rent.com/wp-json/contact-form-7/v1/contact-forms/321/feedback 500 (Internal Server Error)
Note: The same code is working well in localhost[wamp]
I had a similar problem, it turned out that the error was being caused by ModSecurity installed on the cpanel. Disabling ModSecurity did the trick for me. In my research, I came across similar problems that were caused by security modules on their servers like this case that was caused by All in One Security and Firewall.
Had a 500 Status Code as well when submitting my Contact Form 7. Somehow the file "class-phpmailer.php" in "wp-includes" had a filepermission of "0". I have no idea why. But i fixed this issue by changing the files permission to 0644 and now my Contact Form 7 works well, again.
