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Why can't I send emails

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The Thunderbird program will not let me send emails. I keep getting this message: Sending of the message failed. An error occurred while sending mail. The mail server responded: Email rejected. Please verify that your email address is correct in your account settings and try again.I've checked and changed my setting several time but nothing works. I get my emails to download with no problem. This started after the latest update. I'm running Windows 10 on my computer.

The Thunderbird program will not let me send emails. I keep getting this message: Sending of the message failed. An error occurred while sending mail. The mail server responded: Email rejected. Please verify that your email address is correct in your account settings and try again.I've checked and changed my setting several time but nothing works. I get my emails to download with no problem. This started after the latest update. I'm running Windows 10 on my computer.

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Maybe, if you post screenshots of your incoming server settings and of your SMTP server settings, someone may reply. that would provide some much-needed facts. Thank you.