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    Unable to send mail using Google gmail smpt service

    I tried to open port 465, But... ufw allow 465/tcp ufw allow out 465/tcp ``` sudo nmap -sS -p 20-2550 localhost Nmap scan report for localhost ( Host is up (0.000019s latency). Not shown: 2528 closed ports...
    1 By shuming496 Email Firewall DigitalOcean Deployment Ubuntu 18.04