Section
From practice
First-hand experience of setting up and running mail infrastructure. No theory — things we broke ourselves and then repaired.
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What running your own mail server really costs
Not money, not skill — the price is attention. A record of what actually went wrong while setting up a single mailbox.
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DKIM: the pitfalls
The key is right, the service is running, and still nothing gets signed. A debugging session to read along with.
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The legal-notice duty as a gateway for spam
German law requires an openly stated email address. Address harvesters live on precisely that — a duty that holds open a door nobody is allowed to close.