Take look at the last ten work emails you wrote. How many exclamation marks do you see? How many smiley-faces, emoticons, LOLs? Be honest: Is there a YOLO floating around in there?
I won't judge. (OK, just a little, but only for the YOLO.) Over-punctuation is a hazard most office workers face, and as Meredith Lepore at the Levo League points out, it especially plagues women, who use all those extra !!! and :) to make themselves look friendlier, to compensate for bad news, and to just plain make people like them.