Message with red border

Have you read https://contactform7.com/faq/i-get-an-error-message-with-a-red-border-so-how-can-i-solve-this/ ?

This error means the email server refused the email from CF7.

Hi!

I’ve read everything you sent me and I still have this error in every from that I have on my website.

Could you list me some solutions or help me?

Thank you.

In the Postman Email Log (Tools < Email Log) you will find the error from the mail server. What is the error?