SETTING MAIL SERVER

Case : Connection closed by foreign host

systemctl status postfix
● postfix.service - Postfix Mail Transport Agent
     Loaded: loaded (/lib/systemd/system/postfix.service; enabled; vendor prese>
     Active: active (exited) since Wed 2023-01-04 17:59:34 WIB; 2min 4s ago
       Docs: man:postfix(1)
    Process: 1696 ExecStart=/bin/true (code=exited, status=0/SUCCESS)
   Main PID: 1696 (code=exited, status=0/SUCCESS)
        CPU: 1ms

ufw status
Status: active

To                         Action      From
--                         ------      ----
Apache                     ALLOW       Anywhere
80/tcp                     ALLOW       Anywhere                   # accept Apache
443/tcp                    ALLOW       Anywhere                   # accept HTTPS connections
22/tcp                     ALLOW       Anywhere                   # accept ftp
Postfix                    ALLOW       Anywhere
25/tcp                     ALLOW       Anywhere
465/tcp                    ALLOW       Anywhere
Apache (v6)                ALLOW       Anywhere (v6)
80/tcp (v6)                ALLOW       Anywhere (v6)              # accept Apache
443/tcp (v6)               ALLOW       Anywhere (v6)              # accept HTTPS connections
22/tcp (v6)                ALLOW       Anywhere (v6)              # accept ftp
Postfix (v6)               ALLOW       Anywhere (v6)
25/tcp (v6)                ALLOW       Anywhere (v6)
465/tcp (v6)               ALLOW       Anywhere (v6)