It would be fine to be able to select a color for each defined email account. Let you immediately catch the messages of one particular account.
Would it be good enough if just the account column was colored? The way the spam tools are working in the new Beta the lines are colored in a manner similar to what learning does in v6.
There is another option in the beta, it allows grouping messages together by the account that picked them up, works quite well.
ooooo ooo ooooo .o ooooooo ooooo oooooooooo. .oooo. `888' `8' `888' .d88 `8888 d8' `888' `Y8b .dP""Y88b 888 8 888 .d'888 Y888..8P 888 888 ]8P' 888 8 888 .d' 888 `8888' 888oooo888' <88b. 888 8 888 88ooo888oo .8PY888. 888 `88b `88b. `88. .8' 888 888 d8' `888b 888 .88P o. .88P `YbodP' o888o o888o o888o o88888o o888bood8P' `8bd88P'