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Additional info – I have been using Contact Form 7 since late 2014 and never had a problem til yesterday. I was creating a new form and it gave me the red box error. The other forms were still working fine. I decided to update both Word Press and the Contact Form 7 to the latest versions. Now all my forms give the red box error. I followed the advice in the FAQ link above. I deactivated and deleted Contact Form 7, my forms, and reinstalled – still no luck. I contacted GoDaddy Support and they assured me it was not on their end that my domain email is working fine. I’ve spent two days researching this and nothing I’ve tried works.

I am having this issue also. I am using a proper email address from my domain in the From fields. I also deactivated the Jetpack plugin Contact Form and changed the shortcode on my form. Any other ideas to resolve?

I had the same issue and found this article helpful:
https://webcusp.com/solved-how-to-increase-wordpress-menu-items-limit/

Adding the .user.ini file to my root folder did the trick for me. Here are the instructions:

Create a file .user.ini and add the following code to it and try placing it in WordPress root or in wp-admin folder;

max_input_vars = 5000;

I created the file in text editor. I had to add the first period to the file after I uploaded to the ftp site, so it wouldn’t “hide” the file.

Good luck!