Undelivered Mail Returned to Sender

  • Hey I created some forms on a page and when I test them then always this message goes to the admin mail.

    “This is the mail system at host dd36222.kasserver.com. I’m sorry to have to inform you that your message could not be delivered to one or more recipients. It’s attached below. For further assistance, please send mail to postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message.”

    “The mail system email: host mx-eu.mail.am0.yahoodns.net[188.125.72.73] said: 554 5.7.9 Message not accepted for policy reasons. See https://postmaster.yahooinc.com/error-codes (in reply to end of DATA command)

    Can someone help me with that? Already searched in the forum but find no solution for it..

    Thank you very much!

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