Jira was unable to sent email notification, I tried flush mail queue option temporarily to sent the queued emailt. what is the isssue in JIRA and how to solve.
If you want to do any customizations to email handling in JIRA and JIRA Service Desk, you need this plugin. https://marketplace.atlassian.com/apps/4832/enterprise-email-handler-for-jira-jemh?hosting=server&tab=overview
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