JIRA's standard mail handlers can only create issues in one project - it has no way of knowing how you might define the project in an email.
You need add-ons that can provide handlers that will be able to implement the logic you need to perform to make the decisions on which project is needed. You can write your own, or try out something like JEMH or JETI.
I thought so too, but JIRA documentation(https://confluence.atlassian.com/adminjiraserver071/creating-issues-and-comments-from-email-802592933.html) says : "
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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