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GilaMonster21's avatar
GilaMonster21
New Contributor

AUP#CXSNDR continues to be a problem when sending with attachment

An error occurred while sending mail. The mail server responded:  <**********@cox.net> message rejected. Refer to Error Codes section at www.cox.com/.../email-error-codes.html for more information. AUP#CXSNDR. Please check the message and try again.

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  • GilaMonster21's avatar
    GilaMonster21
    New Contributor

    Your email failed authentication checks against your sending domain's SPF, DomainKeys, or DKIM policy.

    How do I authenticate on the Cox domain? I've had this account for many years.