Enter an email address or domain to check its security configuration
What We Check
MX Records
Mail server configuration
SPF/DKIM/DMARC
Email authentication protocols
MTA-STS
Transport security
BIMI
Brand authentication
How to Check Email Domain Security
- 1
Enter Domain or Email Address
Type the domain name (example.com) or a full email address ([email protected]) into the input field. The tool automatically extracts the domain portion from email addresses. - 2
Run the Security Scan
Click "Check Security" to start the audit. The tool queries public DNS records for SPF, DKIM, DMARC, MTA-STS, TLS-RPT, and BIMI configurations associated with the domain. - 3
Review Your Security Score
Examine the overall security score and individual check results. Each protocol is marked as pass, warning, or fail with a clear explanation of what was found and what it means for your email security. - 4
Follow the Recommendations
Address any failed or warning items using the prioritized recommendations provided. Start with SPF and DMARC, then move to MTA-STS and BIMI. Re-run the check after making DNS changes to confirm they propagate correctly.
Who Uses This Tool
IT Administrators
Security Auditors
Marketing Teams
Small Business Owners
Why Check Email Security?
Email security starts at the DNS level. Every domain that sends or receives email should publish authentication records -- SPF, DKIM, and DMARC -- to prevent unauthorized parties from sending messages that appear to come from your organization. This Email Security Checker audits all six critical email authentication protocols in a single scan, giving you a clear picture of where your domain stands and what needs attention. If you also want to validate individual email addresses before sending, try the Email Validator.
Beyond basic authentication, modern email security includes encryption enforcement through MTA-STS and monitoring through TLS-RPT. MTA-STS tells external mail servers that your domain requires TLS connections, blocking opportunistic downgrade attacks. TLS-RPT collects failure reports so you know when encrypted connections fail. For organizations that want to strengthen brand trust, BIMI allows your verified logo to appear next to authenticated emails in supporting mail clients. Each of these layers builds on the ones below it, and missing even one can leave a gap that attackers exploit. Use the DNS Security Scanner to examine your broader DNS posture, or check your web server encryption with the SSL Certificate Checker.
Running regular email security audits is not optional -- it is a baseline requirement for any domain that handles sensitive communication. Misconfigured records silently degrade deliverability, and a missing DMARC policy gives phishing attackers a free pass to impersonate your brand. This tool performs all checks instantly in your browser with no signup required. For a broader view of your domain security, pair this check with the Security Headers Analyzer to verify HTTP security headers on your web properties.
How It Compares
Most email security checkers online require account creation or limit the number of free scans per day. Services like MXToolbox and Dmarcian offer comprehensive analysis but gate advanced features behind paid plans starting at $15-50 per month. This Email Security Checker provides the same core protocol verification -- SPF, DKIM, DMARC, MTA-STS, TLS-RPT, and BIMI -- completely free with no account, no usage caps, and no data collection. Processing happens through public DNS queries, so your domain information stays transparent and standard.
Where paid platforms add value is in ongoing monitoring, historical trend tracking, and aggregate DMARC report parsing. If you need continuous surveillance of authentication failures across hundreds of domains, a dedicated service makes sense. For one-time audits, post-migration verification, or quick checks on vendor domains, this free tool delivers the same actionable results without friction. Pair it with the DNS Lookup tool when you need to inspect raw DNS records directly.