Tool guide limitationsGuides explain the intended workflow but cannot cover every device, provider or operating condition.
Interfaces and external services can change. Follow the current on-screen controls, check dates and vendor documentation, and verify important results independently before acting on them.
Important: Do not rely on this result alone for purchasing, configuration, security, safety, compliance, contractual or fault-diagnosis decisions. Results can be incomplete, delayed, misleading or wrong. Verify important findings with the relevant provider, manufacturer documentation and an appropriate independent test or qualified professional.
DNS and email
Email & DNS Toolkit guide
Choose focused tools for SPF, DKIM, DMARC, headers, transport policy and DNS change preparation.
Open Email & DNS ToolkitWhat you need
- The required input depends on the selected email tool
How to use it
- 1Choose the specific email question.
- 2Open the matching focused tool.
- 3Provide only the requested public DNS or local message data.
- 4Export evidence if it needs review.
Understanding the results
- Treat results as evidence about publishing or message content, not guaranteed delivery.
Recommended next actions
- Use the guide for the selected email tool and confirm provider-specific settings.
Common problems
- DKIM selectors cannot be reliably guessed and message rewriting can invalidate signatures.
Privacy and security
- Message and DMARC files are processed locally where stated; public DNS names are queried through the service.
Worked example
- Scenario
- Investigating an authentication failure
- Example input
- Start with the affected domain and a raw message
- How to read it
- Use SPF/DKIM checks and the Header Analyser to compare published policy with message evidence.
Limitations
- No SMTP server is required or contacted; live delivery and inbox placement are not tested.
Do not rely on one result for a production, security, safety, purchasing or contractual decision. Verify important findings independently.