Bad habit:I don't close my messages. I make a mess of it. That gives a very long list after a few sessions that are opened on startup. When I open a message I need to do quite some scrolling to the right to find the corresponding tab header. After some time I start closing all of them, without even looking what is in it and why I didn't close it immediately. (A minority I do leave open because I planned to react in some way on the message. I think that way I won't forget. What is nonsense, no way to find something back in that list.) One of those enhancements could help me: - opening new messages on the left, but after the tab with the mailboxes - a way to close them all at once. - on restart, only reopening messages specially marked to be reopened - it would help if a message would open only once. If I try to open it again I would just get the tab wherein the message is already opened - let me set a max time to no longer reopen messages at startup. Or to no longer reopen messages if the tab was not selected for some time - Ordering messages by session in which they were opened. A way to close those that were opened in an older session together. - linking this to a follow up choice. Regrouping them by tag and a follow up choice. Closing and reopening them in those groups. Don't know if this is enough to get me organised. :-) Sorry if something is already possible and I didn't find it in the settings or it is now possible in a more recent version.
You can probably use Tags for that. Then in the quick filter bar (view -> toolbars) click Tags and the tag you want (e.g. Later).