1.7. Disabling the IMAP or POP3 service in Dovecot

Prerequisites

• Dovecot is installed.

Verification

• Display all ports in LISTEN mode opened by the dovecot process:

  # ss -tulp | grep dovecot
  tcp  LISTEN 0  100  0.0.0.0:993  0.0.0.0:*  users:(("dovecot",pid=1405,fd=44))
  tcp  LISTEN 0  100  0.0.0.0:143  0.0.0.0:*  users:(("dovecot",pid=1405,fd=42))
  tcp  LISTEN 0  100     [::]:993     [::]:*  users:(("dovecot",pid=1405,fd=45))
  tcp  LISTEN 0  100     [::]:143     [::]:*  users:(("dovecot",pid=1405,fd=43))

  In this example, Dovecot listens only on the TCP ports 993 (IMAPS) and 143 (IMAP).

  Note that Dovecot only opens a port for the LMTP protocol if you configure the service to listen on a port instead of using a socket.