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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.

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 … (jàng ci lu gën a bari)

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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Thunderbird Send and receive email
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