This is the correct answer. And it is highly unlikely that we (the Atlassian Connect) team will allow this in the future. My own add-on (My Reminders) uses Mailgun to send emails to great success. They have an excellent free plan. I can also recommend Amazon SES.
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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