Currently, when an email is received by an incoming mail handler, new issues are created in a single default project.  While there are methods to support multiple projects for new issues, the configuration required for each project creates significant overhead and greatly reduces the utility of this feature for organizations that have a large number of projects.

It would be ideal if the incoming mail handler could route the new issue to a project based on a project key in the subject line, much as the incoming mail handler can currently route a comment to an issue if the issue key is present in the subject.

E.g. 

 Subject: (ABC) This is a feature request

Would create a new issue in project ABC.

Subjects containing neither a project key or issue key would create an issue in the default project.