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Can't send email all of a sudden - complains about domain - mail server responded: 5.1.0 sender rejected. CXSNDR

 ... use Thunderbird - no changes to my account or TBird settings.

Can send from webmail and gmail to but reply fails with the error.

Had support send me mail to my cox addr directly, WAS able to reply to that one (which means I was replying From:

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