Do you have any plans to add tags/labels in your web and app client? It's a very flexible feature that enable some (very) productivity increasing workflows for me.

Lets say that a mail tick in from the scouts, it's a bill for this years summer camp. With labels I would label it Invoice and Scouting. If I need to see all invoices for 2018 I will just search for that label and received in 2018. Same with mails relating to scouting. Without labels I can only save it in one folder, and searches are not guaranteed to catch everything unless I constantly make sure a search captures the mail every time I would set a label on it.