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Postfix Demystified: Incoming Mail Restrictions
September 24, 2024 Reading time: 40 minutes
There was a time in the early days of the internet when spam, phishing, CEO impersonation, email trojans, and other forms of email abuse were not a thing. Mail servers would happily accept mail from any domain and forward it along to any other domain with no worry of being an unwitting accomplice in evildoing. Alas, those blissful days are long gone and, today, a mail server’s incoming mail policy is a critical early line of defense against these threats.
In this article, you will learn how to configure Postfix to enforce a simple mail acceptance policy for your domain(s). Your policy is determined by the role(s) your server will play (relay, destination, send-only, etc.), where your users typically connect from, and your tolerance for spam and misbehaving mail clients, among other considerations.
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📬 SPF Record Wizard
A strange little man in a long cloak appears suddenly in the room. He is wearing a high pointed hat embroidered with astrological signs. He has a long, stringy, and unkempt beard. The Wizard draws forth his wand and waves it in your direction. It begins to glow with a faint blue glow. The Wizard, in a deep and resonant voice, speaks the word "Fumble!" He cackles gleefully.
Ooops! You dropped the china teapot.