emailrules.today

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Corrections

Corrections are published, dated and kept visible. A reference that hides being wrong cannot be checked.

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Published corrections · newest first
We fixed our pageGlobal · Gmail

Gmail enforces authentication, PTR, TLS and a 0.30 percent spam rate

What changed: Correction: this page said Gmail enforces silently and that Google scopes ARC to indirect mail. Both were wrong. Google's guidelines name the failures they return (4.7.0, 4.7.28, 5.7.1, 5.7.26), and the word ARC does not appear on the page at all. Re-read both help paths and counted; the ARC claim was traced to a citation that does not exist.

Why it matters: If this is wrong, Gmail can reject mail with a clear bounce code or quietly file you in spam.

Do next: Open Google Postmaster Tools and look at user-reported spam over 30 days.Full rule →

We fixed our pageGlobal · Klaviyo

Klaviyo counts Apple machine opens toward revenue by default

What changed: Correction: all three Klaviyo sources carried placeholder dates and two had the wrong article titles. Re-checked against Klaviyo's help centre and corrected.

Why it matters: This is how email teams lose credibility in board decks.

Do next: Open Klaviyo's account-level attribution settings, not the campaign ones, and look at the conversion window and whether opens count toward…Full rule →

We fixed our pageGlobal · Klaviyo

Klaviyo holdout groups need 400,000 profiles

What changed: Correction: the source was cited with the wrong title and a placeholder date. Klaviyo's page is 'Getting started with global holdout groups', last updated 23 Sep 2025. The effective date was corrected to match.

Why it matters: Without holdouts, “email revenue” is often correlation.

Do next: Check your profile count.Full rule →

FAQ

Awkward questions

Who is this actually for?

People who ship email and are too busy to re-read every PDF: week-one marketers, lifecycle/CRM, deliverability, multi-country ops, DTC brands, agencies — on Klaviyo, Mailchimp, Braze, HubSpot, SFMC, or something else. Pick your tool and geos so product-specific pages only appear when they match. EU and UK are first-class filters. Not for people who sell tools about email and need a fake score to demo.

Why only ~40 rules? Isn’t that… thin?

On purpose. A wall of 400 undated “best practices” is how you look busy and still get burned. Every page needs a primary source we actually read. Thin and checkable beats fat and folklore. Europe, bulk inbox rules, measurement honesty, and protocol topics like BIMI/DMARC policy are on the shelf when we can cite them — not every Member State and not every vendor myth. Coverage map lists what we still refuse to invent.

Is this legal advice?

No. If it were, you’d have a billable hour and a longer PDF. This is a dated operator reference written by an email geek. Confirm anything high-stakes with counsel who knows your facts. Same for “will this make me compliant?” — no tool does that. Lawyers and judges do. We say what the sources say and what to do first on Monday.

Why no trust score out of 100?

Because we refuse to invent a number you can’t audit. Fake scores sell seed tests and panic. You get findings, dates, and links. If that feels less exciting than a red dial, good — you’re not the red-dial customer.

Why should I trust you more than my ESP’s blog?

ESPs sell seats. Seed-score vendors sell fear. AI invents citations when nobody watches. We sell nothing today — no pixels, no placement scores, no affiliate — so we can say when a tool is the problem. A human verifies, dates, and corrects in public. Tools may help draft; they do not ship unsourced claims. Check the primary links. Fail that test and leave.

Do I need an account?

No. Filters live in this browser and the URL. Share the link. That’s it. Accounts come later only if they earn it — not so we can nurture you about email.

I’m an agency. Where’s multi-client mode?

We tried a client-name CRM on the setup card. It made the product feel like work before it felt useful. Role filters + copy link + one-page brief (optional PDF title) is enough for now. Complexity comes back when the free shelf is habit, not before.

Is the quiet changelog a bug?

No. Quiet means nothing material moved. We don’t invent urgency so the homepage looks “alive.” Sticky risks still show what usually needs a person when the market is still.