1[Unit] 2Description=Dovecot IMAP/POP3 email server activation socket 3 4[Socket] 5#dovecot expects separate IPv4 and IPv6 sockets 6BindIPv6Only=ipv6-only 7ListenStream=0.0.0.0:143 8ListenStream=[::]:143 9ListenStream=0.0.0.0:993 10ListenStream=[::]:993 11KeepAlive=true 12 13[Install] 14WantedBy=sockets.target 15