Hi @tengfei
Provided logs does not give any specific ERROR that show a problem with email. What exactly is happening? Was notification working before? Did something change recently?
There is a complete guide with detailed information how to troubleshot problems with notification
https://confluence.atlassian.com/jirakb/troubleshooting-slow-stuck-notification-issues-in-jira-service-management-server-data-center-1041076874.html
Maybe it would helpful in your case.
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