Another method of salt production used by Morton Salt is the evaporation of salt brine by steam heat in large commercial evaporators, called vacuum pans. This method yields a very high purity salt, fine in texture, and principally used in those applications requiring the highest quality salt.
And finally applications use TCP or UDP connections to exchange the data that makes up the application protocol: logging in to servers, requesting and transmitting Web pages, delivering e-mail, and so on.
SMTP is the protocol used to <send> new mail regardless of what protocol is used to <retrieve> new email which is why POP3 and Imap accounts are shown as POP3/SMTP and Imap/SMTP account types in the Outlook account settings. All external internet email is sent using the SMTP protocol from an SMTP server.