Index
Every rule
14 rules. 13 in force today, 1 dated and coming. Each carries its primary source and the date it was last verified.
Consent and tracking 3
Permission to email, permission to measure, and why they are not the same thing.
In forceFR · EU
In France, tracking email opens needs its own consent
Do I need consent to use tracking pixels in emails in France?
UpcomingIT · EU
Italy requires consent for individual open tracking from 29 October 2026
Does Italy require consent for email tracking pixels?
In forceEU
EU marketing email needs prior consent, with one narrow customer exception
Do I need opt-in consent to send marketing emails in the EU?
Authentication 1
SPF, DKIM, DMARC, alignment, and the traps that pass a checker but fail in the wild.
Provider rules 2
What Gmail, Yahoo, Microsoft and Apple require, with the numbers they enforce on.
Content and claims 3
What a subject line may promise, and what happens when the promise is not true.
In forceUS-WA · US
In Washington, any misleading subject line is a per-se violation
Can a false urgency subject line get you sued?
In forceUS-WA
Washington cut CEMA damages from $500 to $100 per message
How much are CEMA damages per email in Washington?
In forceGlobal · Apple
Apple Mail replaces your preheader with an AI summary
How do I optimise emails for Apple Intelligence summaries?
AI disclosure 1
When AI-generated copy and imagery must be labelled, and when they must not.
Measurement 4
Which numbers still mean something, and which ones your platform is flattering.
In forceGlobal · Gmail
Google Postmaster Tools retired the reputation dashboards
Why did Google Postmaster Tools remove domain and IP reputation?
In forceGlobal · Apple
Open rate is not a measurement any more
Are email open rates accurate in 2026?
In forceGlobal · Klaviyo
Klaviyo counts Apple machine opens toward revenue by default
Why is Klaviyo revenue higher than Shopify revenue?
In forceGlobal · Klaviyo
Klaviyo holdout groups need 400,000 profiles
How do I measure email incrementality in Klaviyo?