Voltaire revealed the secret in June of 1738: "le secret," wrote the author of Candide, "of being boring is that of telling everything."
Your email signature in Sparrow should not be boring, of course. How about not telling everything, then, but showing some of it?
›› With every email you send reflecting on you, how about adding an image — a logo perhaps — to your signature? In Sparrow, adding photos to signatures is particularly easy.