You should never send primary account numbers[0] over unencrypted protocol or to any system that will store it unencrypted. While most email systems communicat

You should never send primary account numbers[0] over unencrypted protocol or to any system that will store it unencrypted. While most email systems communicate over encrypted protocols, very few encrypt their data store. For security's sake, please never send your SSN over email for any reason. [0] Your SSN is your Primary Account Number for the United States.