*Update*

Reported incident was resolved. The source of the problem was in fact external to Microsoft and all other outgoing messages were not affected.

IT Services
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Previous Description (2015-08-28 10:12:16):

IT Services has received a report that some emails are being returned undeliverable. This is due to some of Microsoft Office 356 IP addresses being blacklisted by a 3rd party company.

Internal messages will not see this issue and most external messages are being delivered as well.

IT Services has contacted Microsoft and expect them to resolve the issue as soon as possible. If you receive an undeliverable message you can try to resend the message at a later time or contact your email recipient via phone or another email address temporarily.


IT Services will update this notice when the issue has been resolved.