Mastering Development System & Network

Sending emails via SMTP with postfix

I have a VPS in which I have installed and setup postfix as a send-only mail server.

This command here works perfectly fine to send mail
echo “This email is a test” | mail -s “This is a test email”

What I want to be able to do is send mail through it from a remote server using SMTP, however, it refuses the connection

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