Unable to send out an email using Mozilla Thunderbird

Attempted to forward a fraudulent email back to JP Morgan Chase bank (abuse@chase.com) and received the following error message (rekeyed in as your system will not accept a paste-up):

"Alert

"An error occurred while sending mail. The mail server responded:  <wrhodin@cox.net> message

rejected. Refer to Error Codes section at https://www.cox.com/residential/support/email-error-codes.html

 for more information. AUP#CXSNDR. Please check the message and try again."

Have not experienced this problem with other email messages.

Thank for looking into it.

Homeuser