Apply Marks (Labels) to Messages in PocoMail

Have you ever notices the dark area between the primary and the secondary rainbow? In contrast to the colorful bows above and below it, no reflected light rays reach the eye from this band -- Alexander's band after Alexander of Aphrodisias who described it some 1800 years ago. But you need neither travel in time nor to Turkey to make your Inbox a colorful (and useful) attraction:
See instantly whether a message needs attention in PocoMail by assigning a colorful label to it.