Inbox Placement Rate
The percentage of delivered emails that land in the primary inbox versus spam.
The percentage of delivered emails that land in the primary inbox versus spam.
Why It Matters
An email in spam is almost as bad as undelivered—open rates for spam folder emails are near zero. Gmail's Promotions tab and spam filters mean 'delivered' doesn't guarantee visibility. Inbox placement is the true measure of whether your emails are seen.
Practical Example
Scenario
A supplement brand uses a seed list test showing 85% inbox placement—15% going to spam or Promotions.
Calculation
If they send to 50,000 subscribers, only 42,500 land in primary inboxResult
After improving authentication and reducing promotional language, inbox placement rises to 92%, reaching 46,000 primary inboxes—an 8% increase in effective reach.
Pro Tips
- 1Use inbox placement testing tools (Glockapps, Inbox Monster) before major campaigns
- 2Gmail's Promotions tab isn't spam—emails there still get ~50% of primary inbox engagement
- 3Encourage replies and engagement, which signals to ISPs that recipients want your emails
- 4Avoid spam trigger words in subject lines: 'FREE', 'Act Now', excessive caps and punctuation
Common Mistakes to Avoid
Frequently asked questions
Put it to work
Related Terms
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7.7x blended return at scale — seven figures attributed, across five straight quarters · Modern Prairie · Apr 2025–Jun 2026 Read the Modern Prairie case study
