How to Run an Inbox Placement Test Before You Blame the Copy
Low open rates get blamed on copy, subject lines, and personalization. Most of the time it's an infrastructure problem. Here's how to find out before you rewrite everything.
When open rates drop, the reflex is to rewrite the subject line. Change the opener. Shorten the email. Test a new angle. Sometimes that's right. But if your emails are landing in spam or promotions, no amount of copywriting will fix the delivery problem. The copy never gets seen.
What an inbox placement test actually tells you
An inbox placement test sends a real email through your sending infrastructure — using your actual domain, inbox, and tracking setup — and checks where it lands across email providers. The result tells you:
- Whether the email reached inbox, promotions, or spam
- What SPF, DKIM, and DMARC returned on the receiving end
- Whether your authentication is working as configured
- Whether your sending infrastructure is clean
This is different from preview tools or spam word checkers — those analyze the content. A placement test analyzes the actual delivery signal.
When to run a placement test
- Before launching any new campaign on a domain
- When open rates drop unexpectedly
- After changing your ESP or sending tool
- After updating DNS records
- After onboarding a new client's domain
- Monthly as a routine check on active sending domains
How to run the test
Use the free inbox placement test at BurnedInbox. The process is:
- Enter your domain
- Get a seed email address to send to
- Send a real email from your actual sending setup to that address
- Wait for the result (usually 2–3 minutes)
- See where it landed and review the auth results
Important: send the test the same way you send campaigns — same inbox, same ESP, same tracking setup. A test sent differently won't reflect your actual campaign delivery.
Reading the results
Inbox
Your email reached the primary inbox. Authentication is working. This doesn't mean your campaigns are performing — it means the infrastructure is clean. Open rate problems at this point are content, timing, or list quality issues.
Promotions
Common for Gmail. Promotions tab placement is often caused by HTML-heavy emails, multiple links, or marketing-style content. Also can be caused by low engagement history. Not a crisis, but worth optimizing.
Spam
Something is wrong with your infrastructure or reputation. Check the authentication results in the test output. If SPF, DKIM, or DMARC failed — fix those first. If auth passed but you're still in spam — it's a reputation issue.
What to do based on results
Auth failure + spam
Fix authentication first. Use the SPF checker, DKIM checker, and DMARC lookup. Then retest. Many spam placements resolve immediately once auth is fixed.
Auth pass + spam
Reputation issue. Check the blacklist checker. If you're listed, request delisting after fixing the root cause. If you're not listed, the reputation damage is softer and will take longer to recover.
Auth pass + promotions
Reduce HTML complexity, reduce link count, try plain text. Also consider whether your email looks too much like marketing — cold email should feel personal, not broadcast.
The mistake everyone makes
Operators spend hours AB testing subject lines while their emails are in spam. The test takes three minutes. Run it first, then decide whether to rewrite the copy.
Run the checks first
Before replacing anything, run a free inbox placement test. You might find the issue is DNS, not the domain — and save yourself a week of unnecessary work.