I suggest that eMClient allow the renaming of the default mail Categories, or the addition of new ones to support greater utility.

Justification:
Starting with eM Client v10, automated category sorting is introduced. However, the feature isn't nearly as powerful as it could be because users are confined by the preset categories (Personal, Promotional, Social, Updates, Forums and Other). The allowed categories mimic the Google Mail categories, which is useful if you are checking GMail in eM Client and want a consistent experience. However, the GMail paradigms arn't entirely appropriate for all email accounts or users. Most categories are outdated, underutalized and too vague to be meaningful. Simply allowing users to rename their categories would make the feature exceptionally more useful.