Guides
Plain-English guides to the hard parts of email — authentication, deliverability and the infrastructure behind reliable sending.
Authentication What Google and Yahoo now require from bulk senders Authentication, one-click unsubscribe and a spam rate under 0.3%. What each rule means, and how to check you meet it. Read the guide
Outbound Cold email infrastructure that keeps your main domain safe How to run outbound at scale without ever risking the domain your customers reply to. Deliverability Warming up a new sending domain, week by week A volume ramp that builds reputation on a fresh domain without tripping spam filters. Authentication Moving DMARC from p=none to p=reject without losing mail The staged rollout that gets you to full enforcement without dropping a single legitimate message.