Product update emails for small SaaS teams.

What Day3 does

Day3 is a focused email tool for small software companies. It lets a team write a short product update and send it to the people who already use their product and asked to hear about changes — release notes, new features, and the occasional "here's what we've been up to."

That's deliberately all it does. Day3 is not a marketing automation platform: there are no lead magnets, no drip funnels, no purchased lists, and no cold outreach. Each customer sends from their own verified domain to their own audience.

How we handle email responsibly

Deliverability and recipient trust are the whole point of the product, so good sending hygiene is built in rather than optional:

• Opt-in audiences only. Customers send to their own existing users. Purchased, scraped, or rented lists are prohibited.
• One-click unsubscribe in every email. Every message includes a List-Unsubscribe header (one-click) and a visible unsubscribe link in the footer, alongside the sender's identity and mailing address.
• Unsubscribes are honored immediately. Opting out adds the address to a per-sender suppression list and removes it from all future sends — no further email is delivered.
• Bounces and complaints are processed automatically. Hard bounces and spam complaints are captured via provider event notifications and suppressed at once; senders with poor metrics are paused.
• Verified sending domains. Senders authenticate their domain with SPF, DKIM, and DMARC before any campaign can go out.
• Content is reviewed. Campaigns are screened for prohibited and high-risk content before sending.