Office 365 Outbound issue (Resolved) Issue / Performance
21 days

The issue should be fixed.

Please verify. Thank you.

Update 12/04/2019 14:27 PM 20 days

Microsoft is currently making changes to their new servers. It appears the 365 team is using *.prod.outlook.com for newer servers vs the previous rDNS name of *.outbound.protection.outlook.com . We have added the new host name to the allowed list which should fix it.

We will monitor the situation. Thank you!