We install JIRA SM DC 5.4.2 on centos7 use trial license.
https://www.atlassian.com/software/jira/service-management/download-archives
Then create a IT Service management project with demo data.
Following the link: https://confluence.atlassian.com/adminjiraserver0904/customizing-email-content-1188768605.html
Jush add some text or hidden the footer for test the customizing email content, but not effect, even restart jira still same.
Not sure it's releate to my trial license or some option about cache(I cannot find a way to clear the cache).
