📮 MX Record Check DNS
Resolve MX records, priority, relay/direct delivery, and A/AAAA match.
One-stop Diagnostics for Common Mail Issues
Enter a domain or hostname to quickly check MX, SPF, DKIM, DMARC, Port Connectivity, TLS/STARTTLS, DNSBL, PTR and more.
🧾 SPF Check TXT
Retrieve SPF from TXT record; analyze mechanism count, include depth, and policy strength.
🔑 DKIM Selector Check TXT
Query selector._domainkey for public keys; supports multiple selectors (comma-separated).
🛡️ DMARC Check TXT
Fetch _dmarc record and parse policy (p/sp), alignment (a=), and report addresses (rua/ruf).
🌐 Port Connectivity (SMTP/IMAP/POP3) Connectivity
Test common ports: 25/465/587, 143/993, 110/995.
🔒 TLS / STARTTLS Evaluation Security
Check handshake protocol version, certificate chain, weak ciphers, and STARTTLS support.
🚫 DNSBL Blacklist Check Reputation
Test common DNSBLs for blacklist entries; supports IPv4 and IPv6.
🔁 PTR Reverse Lookup DNS
Retrieve PTR for outbound IP and verify against HELO/EHLO.
📊 Summary Report
Aggregate results from all tools to generate a one-page overview (✅ OK, ⚠️ Optimize, ❌ Error).
About This Platform
Dovecot.io is an independent mail connectivity and deliverability diagnostics toolkit designed to help engineers quickly locate DNS configuration, TLS, port reachability, and reputation issues. It is not a mail hosting service, nor does it provide commercial mailboxes. With its open JSON APIs, it can be integrated as an internal health-check or self-hosted monitoring panel.
Main Capabilities
MX / SPF / DKIM / DMARC, Port Connectivity, TLS/STARTTLS, DNSBL, PTR
Target Audience
Mail Administrators, DevOps Engineers, Deliverability Experts, SREs
Deployment Model
Frontend-Backend separation with static UI; backend provides
/api/* JSON interfacesIntegration Scenarios
CI/CD health checks, scheduled inspections, alert integration
Compliance & Disclaimer
This site is not affiliated, associated, or endorsed by the Dovecot mail server project. "Dovecot.io" is an independent website providing general-purpose mail diagnostic tools and reports.
This site is not affiliated with the Dovecot mail server project.