Capricorn (Dec. 20-Jan. 19): "Sent from my iPhone. Please excuse any typos."
Capricorns are the project managers of the zodiac. They love Excel, charts, and timely responses. Caps also hate spelling errors. Unfortunately for them, the errors start to pile up after they spend hours responding to emails on their phones (hence the apologetic signature). A particularly spicy Capricorn might use the variant "Sent from a really tiny keyboard."