Every team we talk to obsesses over open rates, but almost none of them measure the one thing that gates every other metric: whether the message reached the inbox at all. Deliverability is invisible until it breaks, and by then you have already lost trust with both your users and the mailbox providers.
Authentication is the price of entry
SPF, DKIM, and DMARC are not optional in 2026. Mailbox providers treat unauthenticated mail as guilty until proven innocent. Getting these three aligned is the single highest-leverage change most teams can make in an afternoon.
- SPF tells receivers which servers may send on your behalf.
- DKIM cryptographically signs each message so it cannot be forged.
- DMARC ties the two together and tells receivers what to do on failure.
Reputation is earned slowly, lost quickly
New sending domains start with no reputation. Ramp volume gradually, keep complaint rates low, and prune unengaged recipients aggressively. One bad send to a stale list can undo months of careful warming.
"Deliverability is not a feature you ship once. It is a relationship you maintain with every mailbox provider, every day."
Inside our email platform we surface these signals in real time, so the moment a domain drifts you know before your customers do. That early warning is often the difference between a quiet fix and a painful incident.