Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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Sending of the message failed. An error occurred while sending mail. The mail server responded: Sender address rejected: not owned by user Please check the message recipient "christine.krieger@a1.net" and try again.

emillevine

Sending of the message failed. An error occurred while sending mail. The mail server responded: <anonymous@[10.0.0.31]>: Sender address rejected: not owned by user a1.914306843. Please check the message recipient "christine.krieger@a1.net" and try again.

why do I get this on new download

Sending of the message failed. An error occurred while sending mail. The mail server responded: <anonymous@[10.0.0.31]>: Sender address rejected: not owned by user a1.914306843. Please check the message recipient "christine.krieger@a1.net" and try again. why do I get this on new download

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If you post screenshots of your server settings pane and your SMTP server settings pane, that may help someone here to make suggestions. thank you

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