I am really confused about this, because I thought Exim and Postfix can authenticate user logins and nothing is required. Reading the page at
Once Postfix is installed, mail can be sent to and from the server, although without a mail server like Dovecot or Cyrus, you will only be able to see the email on the server. "
Now reading at Dovecot's main site http://www.dovecot.org it states:
"Dovecot is an open source IMAP and POP3 email server for Linux/UNIX-like systems"
So does it mean that if I want to read the email messages using my desktop email client software, this is absolutely required due to IMAP and POP3?
Is SMTP protocol used by a mail server like Postfix or Dovecot?