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DKIM: a field note from a driving school
5 Aug 2024
How a driving school deals with DKIM — and what usually goes wrong.
The problem: a 2 MB photo in a 320-pixel slot. The DKIM check fails for a driving school.
We solved DKIM for a driving school by moving it behind a reverse proxy. The old configuration stayed live as a fallback for forty-eight hours, then we pulled it.
We document DKIM in a shared spreadsheet. It is not glamorous, but a driving school can open it on their phone at midnight if something breaks.
The owner at a driving school asked why DKIM matters. We showed them the error page their customers see when it breaks. That ended the conversation.
A friend of the owner at a driving school had set up DKIM years ago. When we audited, the config still pointed at a server they stopped paying for in 2024.
We do not start with a platform when handling DKIM. We write down who types what, who gets the mail, and what must not get lost. That list is always shorter than a vendor pitch deck.
We moved DKIM for a driving school to a provider that supports DNSSEC. It added five minutes to the migration and closed a class of attacks they did not even know about.
After fixing DKIM, we added a monitoring alert. If the record changes or the certificate approaches expiry, both we and a driving school get an email. No surprises.
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