Installation

Install dovecot-pop3d:

apk add dovecot-pop3d

Enable the pop3 protocol in /etc/dovecot/dovecot.conf:

protocols = imap pop3

Allow TCP traffic on the POP3 port (110):

ufw allow pop3

Reload the Dovecot configuration to enable POP3:

/etc/init.d/dovecot reload

Check if Dovecot is listening on the POP3 port (110):

netstat -anp | grep dovecot