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All check types
Network & Protocols

SMTP Monitoring

SMTP monitoring connects to your mail server, verifies the banner and handshake, and measures response time — catching relay outages that users only notice when mail stops arriving.

Mail flow is infrastructure — monitor the server that carries it

What it checks

  • SMTP banner and EHLO handshake
  • STARTTLS negotiation where offered
  • Connection latency to port 25/587

Set it up

  1. 1Add an SMTP monitor with host and port
  2. 2Enable TLS verification for submission ports
  3. 3Alert the on-call contact for mail infrastructure

FAQ

Can it verify a full send, not just the banner?

The check validates the protocol handshake — enough to know the service is answering. End-to-end mail delivery is better covered by a heartbeat monitor fed by a test mailbox.

Related check types

Ping MonitoringRaw reachability with real ICMP — not a TCP shortcutTCP Port MonitoringAny port, any protocol — answer the only question that mattersUDP MonitoringThe protocol nobody monitors until DNS or a game port dies

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