Feedback
Please let users know that they must complete their message in whatever the time limit is or the message will not get sent. I had to re-create my message after the first attempt at submission. Fortunately, I copied my second attempt before submitting, so when that one failed, I was able to send it on the third attempt by copying and pasting right away.
The form as it is is user-hostile. The URL for the form is like this: https://domaincontact.cloudflareregistrar.com/whatever-the-domain-is.domain-extension.
(This is the first time in over 2 decades of Internet use I have ever tried to contact a domain owner this way. I doubt the form gets much use and even less feedback, but it would be nice if it worked better for the end user anyway.)