To Change the Character Marker for Included Text in a Reply
Having a marker for text you include when you reply to a message sets it off from the text you want to add. Mailer provides a right-angle bracket (>) as the default. You can customize this marker to a character of your choice.
Choose Compose Window from the Options menu.
The Compose Window Options dialog box is displayed.
Type the character you want to use under Indent Characters For Included Message.
Click OK or Apply to make your changes take effect.