Two kinds of number appear on this page and they are labelled differently for a reason. First-party statistics were measured by Digital Patron on its own live client campaigns (sending volume and bounce rate). They describe our campaigns, not industry averages. We do not publish client results or client names without each client's written permission.
Primary-source statistics are quoted from the organisation that sets the number: Google, Yahoo and Microsoft for inbox requirements, the US Federal Trade Commission for CAN-SPAM. Each links to the exact page the figure is stated on. We do not cite a statistic to a blog that is itself citing someone else, and any figure whose primary source we could not reach was left off this page rather than softened with a weaker citation.
Every statistic carries its own last-verified date. Inbox providers revise their thresholds without notice and statutory penalties are adjusted for inflation, so check the linked source before relying on a deliverability or compliance figure in anything consequential. Nothing here is legal advice.
If a number looks wrong, or you have published research that contradicts one, tell us — we would rather correct the page than defend it.