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Email authentication
Tools to verify and validate your email authentication setup.
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Email deliverability audit
Audit MX, SPF, DKIM and DMARC to confirm a domain is ready to send.
Mail header analyzer
Decode participants, authentication results and routing from raw headers.
Email tester
Send a test email and get instant authentication and deliverability feedback.
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SPF Flattener
Flatten SPF records to reduce DNS lookups below the 10-lookup limit.
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Auto-discover all DKIM selectors for a domain via DNS brute-force.
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BIMI logos, VMC/CSR certificates and web page diagnostics.
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CSR parser
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VMC inspector
Inspect a Verified Mark Certificate - issuer, validity and SAN coverage - before you publish BIMI.
Page size checker
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Phishing URL Checker
Check if a URL is flagged as phishing or malware by 4 threat intelligence sources.
corporate.charter.com · 🇺🇸 US · communication-services
Scan week: 2026-03-02
global
#960 / 1090
country US
#482 / 506
index sp-500
#479 / 503
index nasdaq-100
#97 / 101
sector communication-services
#40 / 45
Add an SPF record to authorize your sending servers
Add MX records to receive email
No DKIM key detected for this domain
Upgrade DMARC policy from quarantine to reject for full protection
Deploy MTA-STS to enforce TLS for inbound email
Add a TLS-RPT record to receive TLS failure reports
Enable DNSSEC for your domain to improve DNS security
Each company in the Observatory is analyzed weekly for email authentication standards. The audit provides a comprehensive view of the company's email security posture.
What this page shows:
Q: How is the score calculated?
A: Points are awarded for each standard based on configuration quality, totaling up to 100.
Q: What do the grades mean?
A: A+ is excellent (90-100), F indicates significant gaps (below 50).
| Page | Purpose |
|---|---|
| Observatory Dashboard | Overall overview with key metrics |
| Statistics | Cross-index and cross-sector comparison |
| Email Domain Check | Audit your own domain |