Forum Discussion

GilaMonster21's avatar
New Contributor
4 years ago

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

An error occurred while sending mail. The mail server responded:  <**********> message rejected. Refer to Error Codes section at for more information. AUP#CXSNDR. Please check the message and try again.

1 Reply

  • 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.