Test your email campaigns against real corporate inboxes and security filters. See exactly where your messages end up—inbox, spam, or blocked entirely.
Test against the most common and complex email security systems
Three simple steps to test your email deliverability
Send your email to our test addresses. We check it against real corporate inboxes running Google Workspace, Office 365, and major security gateways.
Our system checks spam filters, link scanners, attachment inspection, and threat protection—the same defenses your recipients use.
See exactly where your email landed at each provider. Know what triggered filters and get specific recommendations to fix issues.
Comprehensive tools to test, monitor, and improve your email deliverability
Test against real Google Workspace and Office 365 accounts with security policies enabled—not simplified consumer mailboxes.
Our AI explains why emails land where they do. Get plain-language insights into what filters flagged and how to fix it.
Automate testing with our REST API. Run tests from your deployment pipeline or build deliverability checks into your app.
Know immediately if your IP or domain gets blocklisted. We check major blacklists continuously and alert you to problems.
Find the words, links, and patterns that trigger spam filters. See exactly what to change before you send to real recipients.
Set up recurring tests to catch deliverability changes automatically. Get notified when your inbox placement drops.
Put two tests side by side to see what changed. Track whether your fixes actually improved deliverability.
Manage multiple brands or clients separately. Each workspace gets its own team members, settings, and test history.
Add your logo to deliverability reports for clients. Perfect for agencies and email consultants.
Track how Google, Microsoft, and blocklists view your sending reputation
See how Gmail rates your sending domain. We connect to both v1 and v2 of Google's Postmaster API to show your reputation in one dashboard.
Understand how Outlook and Office 365 see your sending IPs. Microsoft's Smart Network Data Services tells you if you're being filtered.
Get alerted immediately if your IP or domain lands on a blocklist. We check continuously so you can act before it impacts delivery.
See your sending IP reputation across multiple data sources in one view. Understand if your IP has been flagged for suspicious activity.
Catch reputation problems before they hurt your delivery
Get a clear view of your email performance with our detailed visual reports.
Email Providers Delivery Report
Google Postmaster Tools Integration
Microsoft SNDS Integration
Microsoft Delivery Analysis
Abusix Threat Intelligence
Connect InboxIssue to your existing workflow
Run deliverability tests and receive results directly in Slack. Perfect for teams who live in Slack.
/inboxissue command to run testsReceive real-time notifications when tests complete. Integrate with any system that accepts webhooks.
Our robust API allows you to integrate deliverability testing directly into your email workflows, CI/CD pipelines, and monitoring systems. View full API documentation →
Simple, well-documented endpoints for easy integration
Create tests and retrieve results with just two API calls
Get notified instantly when test results are ready
Comprehensive analysis of inbox placement and filtering
# Create a new deliverability test
curl -X POST https://app.inboxissue.com/api/v1/external_tests \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"external_test": {
"name": "Campaign Test",
"source": "my_app",
"metadata": {"campaign_id": "123"}
},
"provider_types": ["consumer", "business"]
}'
# Get test results (use the id from the response)
curl -X GET https://app.inboxissue.com/api/v1/external_tests/12345 \
-H "Authorization: Bearer YOUR_API_KEY"Find out where your emails really land before you hit send.
Get StartedWe test against real corporate mailboxes with security policies enabled. Most tools test consumer inboxes or simplified environments. We show you how emails perform against the same security layers your business recipients actually use—threat scanning, link protection, attachment inspection, and strict spam filters.
Yes. We support both consumer and business mailboxes. But our strength is corporate email testing—if you're sending to companies using Google Workspace or Office 365, you'll get the most value from InboxIssue.
Send a simple API request to start a test, then poll for results or receive a webhook when it's done. You can run tests from your deployment pipeline, integrate with your email platform, or build deliverability checks into your own application.
We test against Google Workspace and Office 365 with their security features active—including link scanning (Safe Links), attachment inspection, spam filtering, and email authentication checks. You see how real corporate security policies affect your emails.
Businesses use additional security layers that consumers don't have. They scan links, block risky attachments, and apply stricter spam rules. An email that reaches a Gmail consumer inbox might get blocked at a Google Workspace account. InboxIssue shows you these differences.