Troubleshoot Prometheus Alertmanager SMTP requirements

Solution Verified - Updated -

Issue

  • Alertmanager does not support unencrypted connections to remote SMTP endpoints
  • The Go package smtp.Sendmail used by Alertmanager does not support unencrypted connections
  • The Go package smtp.Sendmail requires the STARTTLS method (explicit TLS)
  • The default behavior of port 465 is not supported (implicit TLS)

Environment

  • Red Hat OpenShift Container Platform (RHOCP)
    • 4
  • Prometheus Alertmanager

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