Setting up my own SMTP server

These are just my personal notes. No warranty whatsoever.

Why

Might become necessary because OVH don’t offer SMTP service to their cloud servers.

Questions:

• Should I change inet_interfaces in my main.cf from all to localhost or loopback-only?

Sources:

• How To Install and Configure Postfix as a Send-Only SMTP Server on Ubuntu 14.04

• SPF kirje

• Sender Policy Framework - SPF Record Syntax