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SPF: a field note from a roofing crew
1 Mar 2026
How a roofing crew deals with SPF — and what usually goes wrong.
The problem: a certificate that expires on a Sunday. The SPF check fails for a roofing crew.
A form that collects data for a roofing crew should say where the message goes. Nine fields and a captcha on a quiet Tuesday will cost you the person who actually wanted to pay.
We underestimated how long SPF migration would take for a roofing crew. The estimate was two hours; the reality was a full day because a certificate that expires on a Sunday had never been documented.
You do not need a status page if you have never gone down. a roofing crew is on month fourteen of zero downtime, and the secret is boring: correct SPF and a host that does not oversell.
Nobody at a roofing crew could remember who had configured SPF. The credentials were in a text file inside a folder called OLD STUFF on a shared drive.
If you only touch SPF once a year, a dashboard is extra risk. Files, a mailbox you read, and a person who still answers will outlast any SaaS control panel.
We found a certificate that expires on a Sunday during a routine check of SPF. The site had been leaking referrer data for six weeks before anyone noticed.
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