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"Mailbox Unavailable" error

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RMYE
RMYE
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I have two AOL/Verizon email addresses in my Mozilla Thunderbird email system. They have identical server settings. One of the addresses works fine, but oddly I get the following error message when I try to send email using the other address:

“An error occurred while sending mail. The mail server responded: Request failed; Mailbox unavailable. Please verify that your email address is correct in your account settings and try again.”

I have two AOL/Verizon email addresses in my Mozilla Thunderbird email system. They have identical server settings. One of the addresses works fine, but oddly I get the following error message when I try to send email using the other address: “An error occurred while sending mail. The mail server responded: Request failed; Mailbox unavailable. Please verify that your email address is correct in your account settings and try again.”