Links for removing Gmail Important automatic tags in eM Client IMAP accounts and Automatic tagging of Gmail accounts and how to disable.
https://forum.emclient.com/t/emails-are-being-autotagged-as-important-and-i-cant-turn-it-off/79353
https://forum.emclient.com/t/how-to-manage-disable-automated-tagging-orders-social-etc/65713