When sending a fax through Fax Thru Email, you can create a cover sheet for your fax through the application itself.
To Create a Fax Cover Sheet
If you want to use a different cover sheet template, click Change Template, and then select the template. (The options that display vary depending on the template you selected.)
NOTE: Selecting a different cover sheet template while sending a fax does not change the default template. To change the default template, select the template through your fax settings. For more information, see Setting Your Cover Sheet Options.