When printing an email, the font is extremely small. I searched here and was instructed to go to 'Print Preview' and adjust the scaling. That works in Firefox but is not working in Thunderbird with an Epson XP-640 printer. I get a momentary flash on the screen and the message indicates that this is the print preview at the bottom, but there is no print preview window (as in Firefox) and no option for scaling. Need some help. Can't read the email when printed for the font is about 1 point in size.