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553 SPF (Sender Policy Framework) domain authentication fail.

  • 1.  553 SPF (Sender Policy Framework) domain authentication fail.

    Posted Sep 26, 2017 10:19 AM

    I am receiving this message awhen sending some emails. I have never received this before. Any suggestions on how to fix it?

    553 SPF (Sender Policy Framework) domain authentication fail. Refer to the Troubleshooting page at http://www.symanteccloud.com/troubleshooting for more information. (#5.7.1) 

    Remote-MTA: dns; cluster5.us.messagelabs.com. (216.82.250.99, the server for
     the domain duffandphelps.com.)
    Diagnostic-Code: smtp; 553-SPF (Sender Policy Framework) domain authentication
     553-fail. Refer to the Troubleshooting page at
     553-http://www.symanteccloud.com/troubleshooting for more
     553 information. (#5.7.1)
    Last-Attempt-Date: Tue, 26 Sep 2017 06:56:21 -0700 (PDT)