The idea that you can print a test page indicates that your printer is working fine. That you can print from another application with no problems, indicates that your printer driver, printer port and printer cable are all working fine.
That leaves your e-mail application as the potential problem. Many e-mail applications have a supplemental printer driver that adds
(or overlays) extra features to your standard Windows printer driver. Check the printer setup under your e-mail application and compare it to the standard printer setup in other apps. If it is different, maybe a setting could be messed up. This might be easy to fix. If need be, you may have to re-install the e-mail application to eliminate the problem. But be careful to save any stored e-mails and e-mail address books you have before erasing anything!