Our email security provider adjusted the outbound IP addresses on Friday by removing the deferrals which has allowed outbound e-mails to be sent to Microsoft addresses.
Posted Jan 16, 2019 - 10:25 EST
Investigating
We are currently investigating reports of intermittent issues with outbound e-mails being sent to Microsoft addresses. This issue can be circumvented by disabling the smart host authentication on the exchange server so e-mails are sent directly.