Architecture of Email SMTP, POP, IMAP, MIME 1 Email, or electronic mail, is a method of exchanging digital messages from an author to one or more recipients 2 Early email systems required the auth[.]
SMTP, POP, IMAP, MIME Email, or electronic mail, is a method of exchanging digital messages from an author to one or more recipients Early email systems required the author and recipient to both be online at the same time Similar to instant messaging Today’s email systems are based on a storeand-forward model Email servers accept, forward, deliver, and store messages Neither the users nor their computers are required to be online simultaneously An email consists of components: Envelope Header Body Envelope- The “envelope” of an email is similar to a paper envelope for mail It conceals the contents of the mail Encrypts email into a data packet Header- contains control information including things like, sender address, recipient address, timestamp, cc, bc, etc Body – Text body of email SMTP – Simple Mail Transfer Protocol Internet standard for electronic mail Network-based email was initially exchanged on the ARPANET in extensions to the FTP In the 1970’s SMTP grew out of these standards Email is submitted by a mail client(MUA, mail user agent) to a mail server(MSA, mail submission agent) using SMTP The MSA delivers the mail to its mail transfer agent (MTA) 10 ... simultaneously An email consists of components: Envelope Header Body Envelope- The “envelope” of an email is similar to a paper envelope for mail It conceals the contents of the mail Encrypts email. .. establish a recipient of the message DATA- signals the beginning of the message text; content of message rather than its envelope Includes header and body 14 15 Post Office Protocol (POP)... address, timestamp, cc, bc, etc Body – Text body of email SMTP – Simple Mail Transfer Protocol Internet standard for electronic mail Network-based email was initially exchanged on the ARPANET