For developers, however, Internet e-mail involves a dizzying standards and formats requires Internet Programming. Email all standard e-mail today and put them together in an easily readable form. David Wood has compiled his knowledge of a broad array of topics to make this guide both for developers and technological curiosity. He explains what makes Internet e-mail work and then dive into the Multipurpose Internet Mail Extensions (MIME), / Secure Multipurpose Internet Mail Extensions (S / MIME), Open Pretty Good Protocol (OpenPGP), and Post Office Protocol 3 (POP3) standard. Simple Mail Transfer Protocol (SMTP), Internet Message Access Protocol (IMAP), and vCard - e-mail version of business cards - also closed.