Monitors
Monitor mail servers and your email authentication policy (SPF, DMARC, DKIM).
Email problems are quiet — messages just stop arriving. These monitors watch both the server that sends or receives mail and the policy that decides whether your mail is trusted.
SMTP
Connects to a mail server and verifies it's healthy and well-behaved.
- Connection & timings — that the server accepts connections, and how long each stage takes.
- Open-relay check — a default rule that flags a server willing to relay mail for anyone (a serious misconfiguration).
- Presets: connection failure, slow response, open relay, PTR issues.
Email policy (SPF / DMARC / DKIM)
Checks the DNS records that protect your domain from spoofing and keep your mail out of spam:
- SPF — which servers are allowed to send for your domain.
- DMARC — what receivers should do with mail that fails checks.
- DKIM — cryptographic signing of your messages.
The verdict is shown in plain language, with the specific record that's missing or weak.
A p=none DMARC policy is reported as informational, not a failure — it's a
valid monitoring-only stance, not a misconfiguration.
Alert presets
- Policy gap — a required record is missing or misconfigured.
- Record changed — your SPF/DMARC/DKIM changed unexpectedly.