[Unit] Description=Dovecot IMAP/POP3 email server activation socket [Socket] #dovecot expects separate IPv4 and IPv6 sockets BindIPv6Only=ipv6-only ListenStream=127.0.0.1:143 ListenStream=[::1]:143 ListenStream=0.0.0.0:993 ListenStream=[::]:993 KeepAlive=true [Install] WantedBy=sockets.target