The footer in an  email created by Outlook is called a signature.

To create you own signature in Outlook:

1. Open Outlook and select Tools / Options
2. Click the Signatures tab
3. Tick the first box Add signatures to all outgoing messages (and also remove tick from second box to add it to replies)
4. Click the New... button
5. Now type what you wish to display in the signature in the box labelled Text (see news item called Will your Company Website or Email attract a fine?)
6. Click the OK button