We experienced delays with delivering outgoing email email from our Dallas server WWW-29 to domains hosted on Microsoft 365.
16:20 GMT Original report
Email from our Dallas server WWW-29 is currently unable to deliver. Microsoft has placed a greylisting restraint on the main server IP address due to a supposed “change in the email patterns”. We have reached out to Microsoft to have the limits removed.
We are still awaiting response to our support ticket with Microsoft. In the meantime, we are mitigating the problem by using a secondary IP address (that is not greylisted) for outgoing email. All services are normal at this time.