Find out where your next email lands.
Run an inbox placement test before the campaign goes out. See provider seed results for inbox, Promotions, spam and missing messages, then investigate the destinations that need attention.
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Test the campaign through your real sender.
Keep the sending domain, subject, content and tracking you plan to use. Send from Mailchimp, Klaviyo, Brevo, HubSpot or another ESP to the seed recipients supplied for your test.
How it works: create the test, add its unique marker as instructed, send to its current seed list and wait for completed results. The marker connects the arriving messages to the right run.
Follow a campaign placement walkthrough
See which destinations need attention.
Review individual provider outcomes and sample counts instead of relying on one overall percentage. Consumer and business mailboxes can filter the same campaign differently; use the available seed coverage for the audience you need to check.
Keep Promotions separate from spam and let pending results complete. For missing messages, check sender logs and the test setup. For spam results, review authentication and content, make one explainable change and retest.
Read provider results and placement rates
Inbox placement test questions
What is an inbox placement test?
An inbox placement test sends your message to a set of provider seed accounts and checks where each sampled email arrives. MailSlurp separates inbox, Promotions, spam and not-received outcomes so you can investigate the provider and message before your next send. See the inbox placement workflow.
How do I run a test from my email platform?
Create a test in MailSlurp, copy its current seed recipients and include its unique marker exactly as instructed. Send the campaign through your real ESP to those recipients, wait for the test to finish and inspect the provider results. A campaign send preserves the sending path and tracking you intend to use. Follow the seed-list setup guide.
Does Promotions mean the email went to spam?
No. Promotions is a Gmail inbox category. Keep it separate from spam when reviewing the result. Check the provider-level outcomes and sample counts before summarizing the campaign's placement. Understand inbox placement rates.
What should I do with pending or not-received results?
Let pending checks finish before judging the run. For a completed not-received result, check the recipient list, test marker and sender logs before treating it as a spam verdict. Correct the sending problem and run a new test with its own current seed list and marker. Read the test setup and result documentation.
Can a good result guarantee delivery to every subscriber?
A seed test records what happened to the sampled messages and accounts. Individual subscriber history, provider filtering and later sending changes can produce different outcomes. Keep the sender and campaign comparable between tests, and use the result alongside authentication and sender-health checks.
Check the destination before the audience sees it.
Create a placement test, send your campaign to its seed recipients and review the completed provider results.