Have you gotten an email that has a "read receipt" request? You can manage how Outlook handles these requests.
Outlook 2010
- Select the File tab, then Options
- Choose Mail
- Scoll down to Tracking
- To set tracking options for any message received that includes a read receipt request:
- Choose from Allow, Never, or Ask
- Click OK
Outook 2007
- Select Tools, then Options
- Go to Preferences tab
- Click E-mail Options
- Choose Tracking Options
- Under "Use this Option" you can select "Never send a response"
- Click OK