Guides
The parts of email that are actually hard.
Authentication, unsubscribe compliance, consent records, sender reputation, and the arithmetic behind email pricing. Written because day3 has to get all of it right, not because a content calendar needed filling.
Elsewhere on the site
- DeliverabilityAuthenticated domains, one-click unsubscribe, and automatic suppression of bounces and complaints.Read on
- How send-based pricing worksWhat counts as a send, what happens at the monthly cap, and why list size never moves the bill.Read on
- SecurityEU-only hosting and data residency, an honest compliance posture, and every sub-processor named.Read on
- GDPRHow day3 acts as your processor, the rights it upholds, and the agreements on offer.Read on
- APIOne REST API for your app's transactional email, your audiences, and your campaigns, plus an MCP server that turns your AI editor into a composer. Built so migrating from another provider is one script and staying in sync afterwards is a webhook handler.Read on
- PricingNine plans from $1/mo for 1,000 emails to $220/mo for 1,000,000. Unlimited subscribers on all of them.Read on
Or just try it.
Verify a domain, import a list, send a real campaign to your own team. All on the free tier.