See: https://forum.kde.org/viewtopic.php?f=215&t=55940
--Mark Felix Rubio Dalmau <fe...@kngnt.org> wrote: > Hi all, > > When I send a message to trash, without previously reading it (just > with the subject is enough to say I do not want to read it), it remains as > "unread". Then, clients (I am using Kmail) report there are unread message, > when all of them are in Trash. The question, then is: Is there any way to > automatically mark a message as read, when that message is moved to Trash? > > Thank you! > Felix