I am receiving so much emails and if I haven't read them before they are coloured blue in bold font. If I have read them but not answered them yet, they are black in bold font. If the program does crash or has to be closed by some reason while there are still messages in blue, they are black after the restart although I have not read them yet.
For me it would be really helpfull if the really never read messages do keep visible as unread ( so that they keep the blue colour ) and that if I read it I could change the colour of it to a color which I know what to do. Do for example; if I have read it, but not answered it yet and have no time at that moment, but later, I want to color them as red or yellow, or whatever color.