domain health
Domain Health Checks: What They See and What They Miss
A health check reads what is public. What that covers, what it cannot tell you, and how fast the answer goes stale.
Verificador de salud del correoPruébelo en su propio dominio primero. Gratis, sin cuenta.What is an email health check?
An email health check scans your domain for the things that decide whether your mail reaches the inbox: SPF, DKIM and DMARC configuration, MX and reverse DNS, MTA-STS, and whether your domain or IP appears on major blocklists.
Why it matters
Most deliverability problems trace back to a misconfiguration you cannot see from your own inbox. A health check surfaces them in one place so you know exactly what to fix before your next send.
What to do with the results
Fix any failing authentication first (SPF, DKIM, DMARC), clear blocklist listings, and verify the lists you send to. Monitor DNS and reputation over time, since deliverability can drift without warning.
What this check cannot see
It reads what is public: your DNS records and your blocklist status. It cannot see your complaint rate, your engagement history with a given recipient, or what a specific provider thinks of your domain today. Those come from DMARC reports and Google Postmaster data, not from a DNS lookup.
How often to re-run it
Before any significant send, and after any DNS, IP or platform change. The honest limit of a one-off check is that it describes this minute. A record edited the day after a clean check fails silently until something makes you look again.
Check yours now
Run your domain through the free email health check, then check the domain and its mail servers separately with the free blocklist checker. Whatever fails, the matching generator produces the exact record to publish.
Preguntas frecuentes
Is the email health check free?
Yes. You can check your domain’s deliverability health for free.
What does it check?
SPF, DKIM and DMARC records, MX and reverse DNS, MTA-STS, and major domain/IP blocklists. Those are the core signals mailbox providers use to filter mail.
Why are my emails going to spam even though everything passes?
Authentication is necessary but not sufficient. Low sender reputation, spammy content, poor list hygiene, or a cold IP can still cause spam placement. Monitoring reputation, DMARC reports, and content helps you diagnose it.
How often should I check?
Before any major campaign and after any DNS, IP, or ESP change. Deliverability can drift without warning, so periodic checks are wise.
Is this the same as a spam test?
No. A spam test scores a specific message. This checks the domain behind every message you send, which is why a clean health check and a spam-foldered campaign can happen at the same time.
How do I fix a failing record?
Use the matching free generator: the SPF, DKIM or DMARC generator produces the exact record to publish, then re-run this check once the DNS TTL has expired.
Más guías
- SPFSPF Record Setup Guide
- DKIMDKIM Record Setup Guide
- DMARCDMARC Record Setup Guide
- email headersReading Email Headers
Estas herramientas responden la pregunta una vez. El monitoreo continuo vuelve a revisar su dominio cada 6 horas y le avisa cuando la respuesta cambie, desde $14/mes. Precios
