credentials to use postfix to send emails

I have installed and configured postfix for sending emails only. Works ok as per the command line given in the tutorial. Would like to use it to send some notifications from a unifi controller hosted on the same server and one hosted on another server on Amazon. What credentials do I use to send emails out (hostname/ip, username, password, port)

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hostname/ip is your droplet ip the postfix installation is on. Username usually is the account you’re signing into for example Password whatever you set it to during installation and configuration. If you setup SSL it should be port 465