On Wed, Oct 27, 2021 at 08:23:49PM +0000, Andy Smith wrote:
https://www.mailop.org/
Linked on that page is "Best Practice for Servers" and that article
goes through some of what you'll need to do to maximise your
deliverability. You'll see it's quite a technical burden. Even more
so if you have untrusted folk sending through you.
And this is the more in-depth post that the above-mentioned article
was distilled from:
https://bridge.grumpy-troll.org/2020/07/small-mailserver-bcp/
For context I would say you are a "small" mailserver if you send
only a few thousand emails per day, or less.
Cheers,
Andy
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