How to restore python file removed by accident

Hi everyone, I removed by accident the file "email.py" inside "bridge" folder of python2.7 (/usr/lib/python2.7/bridge). I never updated the firmware, so I have the stock version of arduino and openwrt software. Where can I find a version of this file online? I tried to remove python package and to reinstall it but to no avail.

Thank you in advance :)

You seem to exclude upgrading the yun, while it will (also) solve your issue