All of a sudden I can't send email to my hotmail account from my business domain, which is on my safe list AND
I have been doing for the past decade !!

Here is the return message:

This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
  *** Email address is removed for privacy ***
    (ultimately generated from *** Email address is removed for privacy ***)
    SMTP error from remote mail server after end of data:
    host mx1.hotmail.com [65.55.37.120]: 550 5.7.0 (COL0-MC4-F13) Message could not
be delivered. Please ensure the message is RFC 5322 compliant.

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