Pesan Eror yang didapatkan
Jun 28 03:58:06 bizmail2 systemd: Started HAProxy Load Balancer. Jun 28 03:58:06 bizmail2 systemd: Starting HAProxy Load Balancer... Jun 28 03:58:06 bizmail2 haproxy-systemd-wrapper: [ALERT] 178/035806 (18354) : Starting frontend ft_smtp: cannot bind socket [0.0.0.0:587] Jun 28 03:58:06 bizmail2 systemd: haproxy.service: main process exited, code=exited, status=1/FAILURE Jun 28 03:58:06 bizmail2 haproxy-systemd-wrapper: haproxy-systemd-wrapper: exit, haproxy RC=1 Jun 28 03:58:06 bizmail2 systemd: Unit haproxy.service entered failed state. Jun 28 03:58:06 bizmail2 systemd: haproxy.service failed.
Solusinya jalankan
setsebool -P haproxy_connect_any=1
Kemudian restart kembali haproxy