The mentioned error always occurs when the VON address does not match the website domain. This is often the case if the content of the [your-email] field is entered in the FROM field.
Solution: Here also the address should be deposited, which is also indicated in the AN field. In order to have the correct recipient when replying to this e-mail and not to reply to yourself, you can enter the following in the Additional Headers: “Reply-To: [your-email]”.