Hi @Stanislav Kotakov
Yes, you can process emails in other types of project. It is a global setting though, not done inside the project like it is in JSM projects, and I don't think it's as good as the JSM email channel, or as easy to set up.
As an admin, go to admin -> system -> mail -> incoming mail. You'll find a list of mailboxes that Jira is looking at for email, and a list of "email handlers". You will need to add one of each, an email inbox first, because the handlers need to be told to read from the inbox.
There are several types of handler, but I tend to stick with the "create or comment" one as the most useful. This looks at the email summary, and if it finds an existing issue key (in any project) treats the email as a comment on that issue. If it can't identify an existing issue, it creates a new issue in the project it is configured for.
I would recommend using named pairs - avoid having many listeners looking at one email inbox unless you are 100% sure that you can configure each handler to not pick up issues intended for the other handlers.
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