Hi Guys,
Spent a couple of hours troubleshooting why mail sent through mail.shaw.ca was not being received by users on office365 hosted accounts.
Turned out SHAW made some infrastructure changes which was resulting in mailflow to office365 accounts failing.
Microsoft techs were somewhat helpful, while the SHAW business techs were worse than useless (the tech wouldn't even escalate a ticket even when the potential scope of impact was explained to him - and wouldn't do anything helpful at all).
In the end I had to setup authenticated SMTP on office 365 to get around SHAW's screwup.
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