If you do not need more than 5 stages on the Kanban, you can indeed use the Gmail Multiple Inboxes to easily moving the emails through the different panes. Play with different Google Stars to easily move the emails and, in the end, just unstar the message to clear it of your way. Bast practice to keep the inbox clean, once you added a star on your email and this is picked up with the Multiple Inboxes, ARCHIVE the message. It will still be visible in the Multiple Inboxes but cleared from your Indox. See more on the first video of my Youtube Channel: https://www.youtube.com/channel/UCoPEE8RAtxJ3OhnlgeBVWEQ Let me know if this could fix the problem in case Gmail is the platform.

I don’t use Gmail for business purposes, which is the area where this sort of interface shines. Gmail is absolutely n.1 in personal email, but a lot (most?) business email still runs through outlook, and that’s where the money is.

DragApp does this - https://www.dragapp.com (not affiliated, just tried out their first beta)

Gmelius does offer kanban boards within Gmail. Boards are 2-way synced with Gmail labels or shared inboxes, and can be shared with specific teammates. https://gmelius.com/trello-gmail

Already built in. Enable multiple inboxes in Gmail and use labels for all these.

We do a combination of labels and stars. The last ones are easier to change and if you only pick a minimal number of stars it is not that complicated to remember them and rapidly click through them until you select the right one. See more on the first video of my Youtube Channel: https://www.youtube.com/channel/UCoPEE8RAtxJ3OhnlgeBVWEQ