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Email Deliverability · Inbox placement testing

Inbox placement checklist for 2026

Short answer

A complete inbox placement checklist has 5 setup items and 2 things to audit against. Work through setup in order, then schedule a quarterly review.

Setup checklist#

  • ☐ Create seed accounts at Gmail, Outlook, Yahoo, iCloud, and key B2B gateways.
  • ☐ Send each campaign to the seed list before the full send.
  • ☐ Record inbox, spam, promotions, and missing counts per provider.
  • ☐ Correlate drops with content, sending domain, or list segment changes.
  • ☐ Fix authentication, reputation, or content issues before scaling.

Audit checklist#

  • ☐ Confirm you are not: trusting a single seed mailbox per provider; use several with different engagement histories.
  • ☐ Confirm you are not: optimizing for the seed test and not real recipient engagement.

Ongoing monitoring#

  • ☐ Weekly: review provider dashboards (Postmaster Tools, SNDS) and bounce logs
  • ☐ Monthly: re-run the setup verification after any vendor or DNS change
  • ☐ Quarterly: full audit against this checklist

Frequently asked questions#

Why does mail land in Gmail Promotions?

Gmail classifies by content and sender behavior. Promotions is not spam and often performs well; do not over-optimize to escape it.

What is a good inbox placement rate?

Above 90% is healthy. Below 80% indicates a reputation or authentication problem.

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