The text that is automatically placed at the bottom of outgoing emails is called your "signature."
Sometimes people get cute and creative with inspirational quotes, etc. That's fine with me.
What's not fine with me is....when people (at least in a business scenario) don't put their work/cell phones (and maybe event addresses) in their signatures.
If you want to facilitate interaction with others, you need to make it easy for them to find you. So much of our work lives go through email and often times, you may not put someone into your address book until s/he has crossed some sort of threshold in a relationship.
In the meantime, you want to call someone who is late for a meeting, you go to the email thread, and you find nothing...that's frustrating....very frustrating.