Pick the diagnostic that matches the question
Use narrow public tools for one DNS, header, or policy question. Use the full deliverability tester when the problem spans authentication, content, routing, links, and sender reputation.
Tools
Tools & operations
Reading the WillItInbox report, API integration, CI/CD workflows, and the operational craft of running mail.
How to use this topic
Start with the pillar guide for the full model, follow the diagnostic workflow for the current problem, and use the commercial destination when the evidence needs to become a repeatable team process.
Explore free email toolsRun bounded MX, SPF, DMARC, MTA-STS, and header diagnostics before moving into monitored product workflows.
Curated guide
Turn one report into an operating workflow
A single report is useful; repeated checks become operational leverage when they are connected to release reviews, regression tests, webhooks, and team-visible evidence.
Automate what repeats
API, SDK, and webhook workflows are the right fit when validation, monitoring, and deliverability checks need to run inside product flows or release pipelines without manual copy-paste.
Diagnostic workflow
- Step 1
Choose the smallest diagnostic
Start with the free check that matches the current DNS, policy, or header question.
Open workflow - Step 2
Run the complete workflow
Use message testing, validation, monitoring, or placement when the job crosses multiple evidence layers.
Open workflow - Step 3
Automate repeatable checks
Use API, SDK, webhook, and CI patterns for release and operations workflows.
Open workflow
Relevant free tools
- Free tools hub
Open all five public diagnostics from one page.
- Header analyzer
Analyze up to 64 KB of headers without retaining submitted data.
Pillar guide
How to read a WillItInbox deliverability report
·3 min read
Prioritize authentication, routing, headers, content, links, and infrastructure findings without treating the score as a delivery guarantee.
Read pillarSupporting guides
- ·2 min read
Agency deliverability audit template
A repeatable audit structure for agencies reviewing client sender domains, templates, lists, DMARC, and monitoring.
Read - ·2 min read
Mail Tester score vs API validation and monitoring
Compare a one-off spam-score workflow with WillItInbox message testing, validation, API automation, domain monitoring, and DMARC evidence.
Read - ·2 min read
Deliverability QA in CI/CD with the WillItInbox API
How developers can turn deliverability testing and validation into repeatable checks around releases, templates, and imports.
Read - ·3 min read
Email validation API status guide
How to interpret validation API results without treating SMTP evidence as magic certainty.
Read
Frequently asked questions
- When should a free check become a monitored workflow?
- Move to monitoring when evidence must be retained, compared over time, shared with a team, or connected to alerts and remediation.
- Can the API be used in CI/CD?
- Yes. Use stable check identifiers, explicit thresholds, bounded polling or signed webhooks, and archive the report with the release.