JIRA keeps a reference to sent email in notificationinstance so it can try to match up incoming mail with previous conversations on issues. There's no use for the outgoing emails once they've been sent, so there's no storage of them, as it's an issue tracker, not an email server.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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