Emails not sent, getting the error “550 5.7.1 Message rejected due to content restrictions”

23. September 2013 · Write a comment · Categories: Hotmail, Outlook.com
We just moved our domain emails to outlook.com, and when sending to some domains we got the following error:
"Reporting-MTA: dns;blu0-omc4-s20.blu0.hotmail.com
Received-From-MTA: dns;BLU0-SMTP437
Arrival-Date: Mon, 23 Sep 2013 04:22:17 -0700
Action: failed
Status: 5.7.1
Diagnostic-Code: smtp;550 5.7.1 Message rejected due to content restrictions". 

We have even tried to send an empty email and still getting the same error. We have checked our MX Records IPs (65.54.188.78 & 65.54.188.109) in the Blacklists filters and found them blacklisted in the following filters:

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