Outlook offers three different formats to choose from for your e-mail messages: HTML, Rich Text, or Plain Text. These three choices are found in the Options dialog box on the Mail Format tab (in Outlook, choose Tools|Options…). Figure 1 below is a picture of the Mail Format tab. Choose "Plain Text" to send all future e-mails in Plain Text format.

Figure 1

Alternatively, you can choose the message format while composing the e-mail. You can do so by using the Message Format option on the Message toolbar (See Figure 2, below). Click on the "Plain Text " button to compose a new message or convert an existing message to the Plain Text format.

Figure 2

If your toolbar does not show these options, you can add the Message Format options to the toolbar by using the Commands tab in the Customize dialog box (in Outlook, choose View|Toolbars…). Click on Format under the Categories list. In the Commands list, click and drag the "Plain Text, Rich Text, HTML" commands onto the toolbar (See Figure 3, below).

Figure 3