Check personal inboxes
See results across supported Gmail, Yahoo, Outlook.com, Proton Mail and iCloud accounts. Keep each provider's outcome visible.
Better delivery starts before you send.
Know where your email lands and what changed. Combine inbox placement testing, sender warmup, domain monitoring and device previews to protect your next campaign.
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Spot the drop before your next send.
A campaign can reach Gmail's inbox and still land in Outlook's junk folder. Test through your real sending service, compare provider results and see when inbox placement changes.
Run a one-off check before launch or schedule regular tests. Follow inbox, Promotions, spam and not-received outcomes alongside spam scores and sender history.
Explore inbox placement testing
Illustrative test history showing a change in inbox placement.
Include business accounts
Test Microsoft 365 and Google Workspace alongside personal accounts. Compare the filtering your business and consumer audiences encounter.
Bring changes to the team
Get placement-change notifications in Slack or Microsoft Teams, then open the affected sender and run to investigate.
Build sending history at the right pace.
Prepare a new sender or support an existing sender's recovery with controlled email warmup. Increase volume in measured steps and watch delivery and placement as the schedule progresses.
MailSlurp uses inbox receipts, delivery failures, domain health and available placement signals to guide the next target. Connect a supported provider or authenticated SMTP and keep your real sending identity.
Explore email warmup
Illustration of an adaptive warmup schedule.
Keep your sending domain in good health.
A DNS change can affect delivery long after the original setup. Monitor SPF, DKIM, DMARC, MX and blocklist signals, then investigate the exact record or finding that needs attention.
Run checks on demand or on a schedule. Keep passes, warnings, failures and unchecked signals distinct, with a history of changes for each domain.
Explore domain monitoring
Follow changes over time
Compare checks before and after adding an ESP or updating DNS. A changed authentication policy is easier to investigate with its history in view.
Check routing and trust
Review MX records, blocklists, BIMI, MTA-STS and TLS reporting alongside authentication to find configuration problems.
Alert the right people
Choose email, Slack, Teams or webhook alerts and set severity by destination. An alert such as a DMARC policy change points your team to the affected run.
Reach the inbox with an email that works.
Once placement is checked, review what the recipient will open. Preview the delivered message across clients like Gmail, Outlook, Yahoo and Apple Mail on phones, tablets and desktop.
Device rendering reveals layout and appearance problems. Pair it with Email Audit to find content issues before the next campaign.
Explore device rendering
Review light and dark mode
Check supported light and dark targets for lost contrast, disappearing logos and hard-to-read buttons.
Find broken links and images
Audit the delivered email for unreachable resources, personalization mistakes and HTML or accessibility findings.
Explore Email Audit
Inspect the delivered message
Review the email produced by your application or ESP, including its final HTML. Rerun the checks after updating the source campaign.
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 walkthroughCheck once. Keep watching. Or automate it.
Choose the approach that fits the sender and the campaign. Review the results in MailSlurp whichever way you start.
Before a campaign
Send from your usual ESP to a placement test's seed addresses. Review the result before sending to your audience.
Between campaigns
Schedule placement and domain checks. Follow trends and investigate alerts while your sender stays active.
Inside your workflow
Create tests and retrieve results through the API. Connect checks to campaign tools and release jobs with the MailSlurp API.
Deliverability monitoring questions
What should I monitor to protect email deliverability?
Measure inbox placement across the providers your audience uses, follow your sender's warmup progress, and monitor authentication, routing and blocklist findings. Before a campaign, add device rendering and Email Audit to check the message itself. MailSlurp gives each check its own results so you can investigate the sender, the content and the receiving mailbox together.
How is inbox placement different from a successful send?
A successful send means the receiving server accepted the message. An inbox placement test records where it arrived in real seed accounts: inbox, Promotions, spam or junk, or not received. Compare the provider results to see whether a change affects one mailbox service or a wider audience. Explore inbox placement testing.
How do warmup and placement testing work together?
Warmup builds sending history at a controlled pace. MailSlurp uses delivery and sender-health signals to guide the ramp, while placement tests show where sampled messages land. Review those outcomes before increasing volume and run a placement test with the actual campaign before a major send. Explore email warmup.
Can I keep using my current sending platform?
Yes. Test mail sent through your current ESP or application. Use supported sending-service connections for scheduled checks, send a manual campaign to the test's seed addresses, or create tests and retrieve results through the API. Warmup supports native provider connections and authenticated SMTP. Read the inbox placement guide.
Can my team receive alerts when something changes?
Yes. Inbox placement changes can notify Slack or Microsoft Teams. Domain monitoring supports email, Slack, Microsoft Teams and webhooks, with severity settings for each destination. Open the affected run and compare its findings with previous checks to investigate the change. Set up domain monitoring.
Give your next send a better start.
Start free with MailSlurp. Check where your email lands, investigate sender issues and keep the next campaign in view.
