Track spam scores over time
Compare spam scores across repeat tests and spot changes after a new template, sender or ESP. Use the test history to see whether your fixes reduced spam risk.
An Inbox Monster alternative for a confident campaign launch.
Know where your email lands and how it looks. MailSlurp brings inbox placement, real-client previews and content checks into one campaign review.
Trusted by teams at
See where every provider puts your email.
Gmail may put a campaign in Promotions while Yahoo sends it to spam. See each account's result, then inspect content and sender-domain findings to decide what to fix before your next send.
Test your email
Analyze domain health
Check SPF, DKIM, DMARC and spam blocklists alongside inbox placement. Spot authentication problems and blocklist findings before your next campaign.
Connect your ESP directly
Connect your sending service and schedule regular placement tests. Send through your own ESP, keep your real sender and campaign content, and review the results in MailSlurp.
Watch a real placement test.
Follow a test from its seed list to the provider report. See how MailSlurp connects the email you sent with inbox and spam outcomes, then keeps the findings ready for review.
Follow the walkthroughCatch the change before your audience does.
Schedule regular tests through your sending service and catch a drop in inbox placement. Compare runs, open a sender's history and identify the provider that changed.
Run a manual check before a campaign, set up recurring tests or trigger a run through the API. Your team can review every result and investigate spam scores in the web dashboard.
Choose how you test
Example test history showing a change in inbox placement.
Personal inbox coverage
Check Yahoo, Gmail, Outlook, Proton Mail and iCloud accounts to see where your consumer campaigns and notifications land.
Professional inbox coverage
Include Google Workspace and Microsoft 365. Business filtering can produce a different result from a personal account.
Get notified on inbox placement changes
Get inbox placement change alerts in Slack or Microsoft Teams. Keep your team informed when delivery shifts so you can investigate the affected sender or provider.
Three ways to test inbox placement.
Use your real sending service and campaign content. Choose scheduled monitoring, a manual test or the API, with results in the same dashboard.
Schedule regular checks
Connect your sending service, choose your audience and set a schedule. Compare results over time to catch placement changes.
Run a manual test
Create a test, use its tracking code as the subject and send to the supplied seed addresses. Check the result before your next send.
Test through the API
Create tests and retrieve provider results from your own app or workflow. Trigger a check whenever a campaign, template or sender changes.
Give every part of the email a clear result.
Use your actual campaign and sender
A campaign review needs to answer three questions: where did the test land, how does the email look and do its links and images work? MailSlurp gives your team placement results, device previews and Email Audit without changing the ESP that builds the campaign.
Bring the launch email into team review
Try a representative launch email, including its normal tracking links and personalization. Check personal and business provider results, preview the clients your audience uses and share the findings with your reviewers. Use the API when these checks need to become part of a repeatable release.
Questions before you switch?
Can I review appearance and inbox placement for the same campaign?
Yes. Send the campaign from your ESP to a MailSlurp render address for client screenshots, and run a separate placement test through the same sending path. Review layout and content fixes alongside inbox, Promotions and spam outcomes. After changing the campaign, repeat the affected checks so approval refers to the version you will send. Use the campaign rendering checklist.
Can I test a campaign from my existing ESP?
Yes. Create a placement test, use the current tracking marker and send to its seed addresses through your own provider. Review the result for each personal or business account included in that run.
Does a test guarantee inbox delivery to every subscriber?
A result shows where the tested copies arrived during that run. Use repeat checks alongside sender authentication, content and list-quality review to make a better sending decision. Keep Promotions separate from spam.
Know where your next campaign lands.
Send a test through your real provider and inspect the result.
