At View → Sort by → Grouped By Sort you can activate the grouping of your mails by the chosen sort method. E.g. when you select the sort method "Date", you get groupings like "Today", "Yesterday", ...
I am trying to sort the messages in my inbox by the number of messages from / to email address. After having sorted by Sort by -> From and Grouped By Sort and then displaying the Total column, I ...
Is there any way to make Thunderbird sort mail so that unread mail is always at the top and the e-mails are sorted by date in descending order persistently? Maybe an add-on that someone can recommend? ...