Contact Form 7 errors

I have been trying for hours to resolve problems with Contact Form 7. I have read several pages regarding the red box and orange box errors, including documents that I see you referring people to when they have reported the same problem in this forum.

I do not think this is a problem with my mail server, because I can e-mail [email protected] direct from both of my e-mail addresses, and it gets routed correctly and I receive the email.

I read one document that was about being sure the settings were correct, and I have checked those.

If I fill this contact form out with my primary e-mail address, I get the red box warning, which I understand is mail cannot be delivered.

If I fill this contact form out with my alternate Gmail address, I get the orange box warning, which I understand is flagged for spam.

I have reCaptcha v3 formatted just as the instructions say, and had no problem with that. The red error from my primary address was happening both before and after I configured reCaptcha.

I am out of ideas, and I have spent hours trying to solve it by researching through forums. I would sure appreciate any insight you can give.

Thanks.

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