This is intended to be a theoretical/practical tutorial on how to use email certificates to encrypt and digitally sign your emails. There are approximately 2 million emails transferred every hour, out of which 80% are spam, and the email world is really creepy, so I strongly recommend you to read the rest of this post. First of all, let’s cover some theory. There are three Internet protocols involved in sending and receiving emails: SMTP, IMAP, POP Simple Mail Transfer Protocol …