Email Deliverability Auditor
by Kowshik Kuri (Ratul)Updated May 12, 2026
Audits any domain's SPF, DKIM, DMARC, MX records, and DNSBL status to compute a deliverability score. Email administrators and developers use it to validate configurations before launching campaigns or diagnosing bounce issues. Integrates into scripts for automated domain health checks.
spf
dkim
dmarc
+1
|Overview
The Email Deliverability Auditor MCP server checks email domain configurations by querying SPF, DKIM, DMARC, MX records, and DNSBL listings, then generates a deliverability score based on compliance and best practices.
Key Capabilities
- SPF check: Validates Sender Policy Framework records to ensure authorized mail servers.
- DKIM check: Verifies DomainKeys Identified Mail selectors and public keys for signature validation.
- DMARC check: Assesses Domain-based Message Authentication, Reporting & Conformance policies and reporting addresses.
- MX check: Inspects Mail Exchanger records for proper mail server routing.
- DNSBL check: Scans for listings on DNS Blacklists indicating spam reputation issues.
- Deliverability score: Aggregates results into a numerical score reflecting overall email send reliability.
Use Cases
- Before an email marketing campaign, audit sender domains with SPF check, DKIM check, and DMARC check to avoid inbox placement failures.
- Troubleshoot high bounce rates by running MX check and DNSBL check on receiving domains.
- In CI/CD pipelines, automate deliverability score checks for domains added to transactional email services.
- Compliance audits for enterprise email systems using all checks to enforce DMARC policies.
Who This Is For
Email operations engineers monitoring domain health, developers integrating email validation into apps, marketing teams verifying campaign setups, and security analysts preventing spoofing via weak authentication records.