Set up a mail server

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To set up a mail server, you must first be clear

  • what an MTA is
  • what a MUA is
  • what imap is
  • what pop is
  • what smtp is
  • what an MX record is
  • what sendmail is

To explain all this, here is a little story how a mail sending and receiving process could take place: Alice wants to write a mail to Bob. Alice uses kmail as mail program. kmail is her mail user agent, her MUA. She writes to Bob whose address is bob@home.org. Of course, the content of her mail is secret so we won't tell it here. After she clicks "send", her MUA transmits the mail to Alice's outgoing mail server. This mailserver has a little program on it called sendmail.