What does the menu bar icon represent? When I look at it, all I can see is a little guy (Stewey?) with a long square tongue sticking out of his mouth.
It’s a sieve with an envelope coming out the bottom. In other words, the blue part of the application icon from a different angle.
It’s probably easier to see at a larger size:
This probably makes more sense if you remember the original SpamSieve icon:
I can see that. Too bad the icon has to be monochrome.