My email to a Cox address blocked as SPAM?
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
Hello and thanks for contacting us. I recommend you strengthen your email authentication and contact Cox about the error.