Email deliverability checklist for 2026 (the 12 things that matter)

Short answer: the deliverability fundamentals for 2026 are authentication (SPF + DKIM + DMARC), a warmed domain, bounce rate under 2.5%, low spam-complaint rate, one-click unsubscribe (now effectively required by Gmail/Yahoo for bulk senders), and steady volume. Get those right and most cold mail reaches the inbox; skip one and placement collapses.

The 12-point checklist

1. SPF record published and passing.
2. DKIM signing on every send.
3. DMARC policy (at least p=none with reporting; move to quarantine).
4. Custom tracking domain (not a shared one).
5. Warmed mailbox (21+ days) before cold sends.
6. Bounce rate < 2.5% — verify lists first.
7. Spam complaints < 0.1%.
8. One-click unsubscribe header (List-Unsubscribe-Post).
9. Plain, personal copy — no spammy formatting.
10. Per-mailbox daily caps + rotation.
11. Engagement — prune non-openers, prioritise repliers.
12. Monitor reputation (Google Postmaster / placement tests).

Autocloz automates 1–12 — auth checks, warmup, caps, one-click unsubscribe and bounce auto-pause.

> Start free — run the whole checklist on autopilot.