Email Security Tools
Use these tools when you are diagnosing mail delivery, validating authentication records, or checking how a domain presents itself to receiving mail systems. This is the strongest starting point when you need to check SPF, DMARC, DKIM, and related email trust signals together.
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Start With The Right Tool
Run A Full Mail Posture Check
Start here if you want one place to review SPF, DMARC, DKIM, MTA-STS, TLS-RPT, and BIMI together.
Troubleshoot SPF Or DMARC
Use focused record-specific checkers when one part of mail authentication is failing or looks suspicious.
Analyze A Received Message
When a real email is failing or being flagged, parse the headers to see authentication and routing results directly.
Featured Tools
Article Topic Hubs
Email Security Articles
Read practical guides on SPF, DMARC, DKIM, BIMI, MTA-STS, and related email authentication topics.
DNS Troubleshooting Articles
Read troubleshooting guides for propagation, mail issues, DNS misconfiguration, and common operational failures.
Setup And Migration Guides
Read setup and migration guides for common DNS and email configuration tasks.
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Email & Security
SPF Checker
Break down SPF mechanisms, redirects, includes, and lookup count.
SPF Generator
Build an SPF record from common mechanisms and review estimated lookup cost.
SPF Flattener
Generate a flattened SPF-style output from the current effective SPF policy.
DMARC Checker
Inspect DMARC policy, reporting, and alignment tags.
DKIM Checker
Check DKIM records with a selector.
Email Security Check
Review SPF, DMARC, DKIM, MTA-STS, TLS-RPT, and BIMI together.
MTA-STS Check
Check the MTA-STS TXT record and HTTPS policy file.
TLS-RPT Check
Inspect TLS-RPT reporting records.
BIMI Check
Inspect BIMI TXT records and parsed BIMI tags.
Blacklist Checker
Check whether a domain or IP appears on common blocklists.
Email Header Analysis
Analyze email headers for SPF, DKIM, DMARC, and routing clues.
Email Provider Setup Checker
Compare Google Workspace or Microsoft 365 mail DNS patterns.
Featured Articles
How to Fix SPF Softfail
A practical guide to fixing SPF softfail, including how to identify the sending domain, review the SPF policy, authorise senders, and tighten enforcement safely.
Google Workspace SPF, DKIM, and DMARC Setup
A practical guide to setting up SPF, DKIM, and DMARC for Google Workspace, including what to publish in DNS and what to verify after setup.
How to Check a DKIM Record
A practical guide to checking a DKIM record, finding the right selector, validating the TXT record, and spotting common DKIM setup problems.
How to Check a DMARC Record
A practical guide to checking a DMARC record, understanding the main tags, and spotting common DMARC issues before enforcement causes problems.
How to Check an MX Record
A practical guide to checking an MX record, reading priorities and targets, and confirming whether mail is routed to the provider you expect.
How to Check an SPF Record
A practical guide to checking an SPF record, including where to look, how to read includes and qualifiers, and how to spot common SPF problems.