Alerts from Grafana, Prometheus, Sentry, Zabbix, Nagios. When an alert is sent, it must arrive. Median latency under 100ms.
Gmail rate-limits high-frequency alerts. Self-hosted Postfix breaks at the worst possible moment. You need a reliable email channel for monitoring.
Stable endpoint (>99.9% SLA), inbox-priority delivery for alert domains, proper X-Priority handling, IPs that stay clean.
SMTP relay under "Notification channels". Standard setup, just works.
SMTP config in YAML, alert templates in markdown.
Email notification destination using a Bearer API key.
Standard SMTP gateway, compatible with every version.
Create your account, configure your domain and send your first email in 5 minutes.