Recipient address rejected: Access denied – Exchange Online Mailbox Error in Exchange Hybrid Environment
The customer uses Jira onPremise in connection with an Exchange Hybrid whereupon Jira authenticates itself against the onPrem Exchange Server. Remote Server returned ‘550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [ZR0CHE01FT015.eop-che01.prod.protection.outlook.com 2024-02-01T14:50:04.245Z 08DC23158B19B76B]’ NDR from an Testmail PROBLEM One customer received the message that certain users were not receiving mails from an onPremise application, while for the most of the users the mail flow worked without any problems. The customer tried to send mails via the Jira Admin Portal,…