Dear,
I followed those instructions: https://www.digitalocean.com/community/tutorials/how-to-install-postfix-on-centos-6
But it gives me a few qeustions.
I am using NodeJS
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While I would recommend using SSL, if you need to disable it there is a thread on the iRedMail forums here that covers how to do this.
Postfix is just an MTA and not a full mail server. It allows the sending and routing of email but does not provide POP or IMAP services to retrieve mail or mailbox management. You will want to go with a more robust solution. We have a tutorial on setting up iRedMail which may be a better fit for what you’re looking to do.