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The agent interface address should be set to the same as in setting Core → Email → NotificationSenderEmail.
To check if the addresses are the same:
- Go to System Configuration screen.
- Select OTRS in the Navigation widget.
- Navigate to Core → Email in the navigation tree and search for setting
- Change the email address if needed, and remember it.
- Select OTRSAgentEmailInterface in the Navigation widget.
- Navigate to Core → Email → PostMaster in the navigation tree.
- Change the value of key
AgentInterfaceAddressto the same as set in step 3.