A tool for bridging good old SMTP and OAuth2 protected email services. Can be run as a sidecar (recommended) or as a standalone service.
Note: This project is still in an early state and may be unsuitable for production workloads. PR's are most welcome 🙌
- Expose local SMTP server with optional basic authentication
- Send email via Microsoft Graph (Office 365)
- Prometheus metrics (default
:5353/metrics)
The project can be configured using either command line flags, using a configuration file or with environment variables.
The default location is ~/.skyline.yaml
debug: false
hostname: an-overridden-hostname # autodetected by default
port: 30333
metrics-port: 32111
sender-type: msGraph # currently the only implementation
ms-graph-config:
tenant-id: <entra-id-tenant-id>
client-id: <id> # app registration id
client-secret: <secret> # app registration client secret
sender-user-id: <user-object-id> # found by viewing details of an user in Entra ID
basic-auth-config:
enabled: true
username: foo
password: barAll configuration properties can be specified as environment variables by replacing structure indentation, hyphens and spaces with _. All environment variables must be prefixed with SL_.
Use go run, go build && ./skyline or use one of the prebuilt container images.
You can also create your own local image with goreleaser release --snapshot --clean
1. create file with envs local_testing/.env.skyline
SL_BASIC_AUTH_CONFIG_ENABLED=TRUE
SL_BASIC_AUTH_CONFIG_USERNAME=test
SL_BASIC_AUTH_CONFIG_PASSWORD=test
SL_MS_GRAPH_CONFIG_TENANT_ID=
SL_MS_GRAPH_CONFIG_CLIENT_ID=
SL_MS_GRAPH_CONFIG_CLIENT_SECRET=
SL_MS_GRAPH_CONFIG_SENDER_USER_ID=
2. docker compose up -d
3. go to grafana at http://localhost:3000, user:pass admin:admin
4. enable oncall plugin: Administration -> Plugins -> Search for oncall -> Oncall backend url: http://engine:8080
5. edit oncall settings to use skyline. Host: Skyline, TLS: Off
docker compose up --build skyline