Error on Submission

Hello,

The contact form has been perfectly working for many years. I noticed today that an error is being displayed on submission. The error is: “There was an error trying to send your message. Please try again later.”

Here is the screenshot: https://ibb.co/2cMjFnd

Our production server has version 5.9.8 installed. Our dev site has version has version 5.9.6. Both are having the same problem.

I also installed version 6.0 but still getting the same error.

We are using WordPress 6.6.2. The current PHP version we are using is 8.2.25.

Are there any specific PHP variables and extensions required?

Would be much appreciated if someone can help us resolve this issue.

Thanks.

The page I need help with: [log in to see the link]