By Rabbi Julian Sinclair, July 21, 2011
It is circa 1000 CE, and sending letters to people in other cities and even countries has never been simpler. However, along with these amazing advances, comes a new potential problem, invasion of privacy. How can you trust the messengers not to read your mail?
Rabbeinu Gershom Meor Hagolah (the "Light of the Diaspora", 960 - 1040) knew that as the greatest Ashkenazi leader of his day, he h