standard
Email authentication standard (RFC 7208) letting domain owners publish DNS records naming authorized mail servers, helping detect spoofed senders.
No evidence-backed relationships are recorded.
Transactional mail can pass SPF and DKIM and still fail DMARC when neither aligns with the visible From domain, a dev.to Node.js guide shows. Because forwarding breaks SPF, the author treats aligned DKIM as the path to protect.
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Publishers onboarding custom domains should confine wildcard DNS to routing and verify three mail records per tenant, a dev.to guide argues. That costs extra writes and waiting, and it gives every customer its own rollback boundary and audit trail.
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The request came from an unauthorized account on a real government domain, and Revolut acted on it. The company calls the number of affected customers limited, and it declined to say how many or name the agency.
Perspective Coverage
5 publishersReality
Publishing p=none starts an XML report feed and enforces nothing. A practitioner sequence for getting a domain to p=reject turns on an owned sender inventory, aligned DKIM and a written condition for each step.
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RFC 9989 removed the pct tag on 19 May 2026, and a record still carrying pct=25 describes a staged rollout that conforming receivers no longer honour. The replacement, t=y, gives one testing step and no percentages.
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In four codebases a dev.to author found bounce handlers that read 5.x.x and stopped, so a receiver's verdict on the sending domain got written down as a dead mailbox. The RFC 3463 subject digit separates the two.
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The DNS and header half of deliverability is a pure function of your own configuration, so a scheduled job can assert it; inbox placement is a measurement you put on a dashboard with a date on it.
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A dev.to walkthrough splits outbound mail by risk profile. Whether that split changes anything for receivers comes down to one tag: sp= on the organizational domain. Subdomains still need their own SPF and DKIM either way.
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The author of DNS Notify lists seven kinds of change alert that mean nothing, and only the first is cured by changing where the query goes. The other six get fixed after the answer arrives.
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A dev.to walkthrough traces a newsletter whose SPF and DKIM both pass for example.net while the visible From reads editorial.example. The evidence that settles it sits in the receiver's Authentication-Results header.
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The request arrived from what looked like a government agency's domain, cleared all three email authentication checks, and Revolut's compliance team processed it. Notifications to affected customers began on September 11.
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A dev.to onboarding design keeps the SPF, DKIM and DMARC values you generated in one row and the answers a resolver returned in another. Its comparator is a single stripped string match, so an SPF value the customer appended to lands in drifted.
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Microsoft Security Research reported over a million emails pairing fake ServiceNow invoices with forged forward threads. No malware ran, so the investigation lives in mail headers and accounting records.
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A genuine Carnival booking confirmation passed SPF, DKIM and DMARC and pointed at a promotional domain the company had let lapse. Someone re-registered it, wired it into a cloaking network, and the link kept routing for 74 days.
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The email telling Trezor owners their recovery phrases might lack entropy came from a real trezor.io address and passed DKIM, SPF and DMARC, and it described a defect close to the one that took 1,778.84 BTC from Coldcard users.
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The native binding wants the Workers Paid plan, and until Cloudflare's SPF, DKIM, DMARC and cf-bounce records are live it will mail only the destinations you verified by hand. That window picks your integration for you.
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The report records valid DNS, SPF and DMARC, no spam and no malware, then returns phishing true at 95. IPQS puts high risk at 85 and above, and that is the line most integrations copy into a signup gate.
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Presence and enforcement are different questions, and the free checkers only answer the first. The switches that matter are the qualifier on SPF's all term and DMARC's p=, sp= and pct= tags.
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A dev.to post scanned the domains behind the top 5,000 npm packages and found 18 with registration or email-security anomalies. The aggregate numbers matter more than the 18, and the headline overstates both.
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A dev.to architecture piece proposes a procurement test for signup and reset mail: idempotent retries, domain alignment that survives DNS rotation, and event records that stay cheap.
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Build · August 15, 2026 · 1 publisher