My email to a Cox address blocked as SPAM?

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  • updated
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 SMTP error from remote mail server after initial connection:
    554 cxr-ibgw-6003a.stratus.cloudmark.com cmsmtp XXX.XXX.XXX.XXX blocked.
 Refer to Error Codes section at https://www.cox.com/residential/support/email-error-codes.html 
for more information. AUP#CXBL
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john

Unfortunately I don't see "Authentication" in my CPanel so I don't know how to add the suggested DKIM and SPF.  I submitted an email to Support about the missing Authentication button, as suggested in the documentation.

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InMotion Hosting Contributor
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Hello and thanks for contacting us. I recommend you strengthen your email authentication and contact Cox about the error.