I have multiple filters for one mail account to sort my incoming mails. One of those filters should move all incoming mails to a folder, let's call it "Inbox 2016". This is, because I want my general inbox sorted by years/semesters. Some of the incoming mails should not get into the general folder, but into more specific subfolders, depending on subject or author. So I have, let's say two filters: "Filter A", moving mails with "[A]..." in the subject, to "Inbox 2016/A" "General", moving all mails to "Inbox 2016" They are ordered in this way, so "General" is below all other filters. If I order "General" above everything, it will just move my mails to "Inbox 2016" and no other filter applies. Now to the strange behavior of my constellation: The mails are sorted correctly when being loaded from the server: All mails go to the normal inbox, mails with "[A]" then are moved to "Inbox 2016/A" and all others to "Inbox 2016". Now, when I open the folder "Inbox 2016/A" in Thunderbird, the filters seem to be run again for all new mails in this folder (older mails are not touched) and move them to "Inbox 2016". Now I have to go there, read them there and afterwards sort them by applying the filters manually to "Inbox 2016". Does anyone have an idea how I can do this better? A "if mail is in folder X" filter would help, but I can't find one. I also installed the addon "FiltaQuilla" which provides an action called "Stop filter", but adding this action after the move action doesn't help either.