Check the sending log files and concentrate on logs that are sending to nonexistent @hotmail.com, @live.com, @msn.com, @outlook.com?with multiple tries and failures.
Bounce mail
mx1.hotmail.com
mx2.hotmail.com
mx3.hotmail.com
mx4.hotmail.com
Accept mail
*.blu0.hotmail.com
*.col0.hotmail.com
*.dub0.hotmail.com
*.snt0.hotmail.com
Hopefully somebody can help shed some light on the problem.
Thanks
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