Sends mail through Microsoft Graph using an app registration in the customer’s own Entra tenant, so the sending domain, its reputation and the mailbox all stay with them. Your application receives four variables at deploy time and calls Graph directly: two HTTPS requests, no dependency, in any language. Because the registration is theirs, leaving the platform costs nothing, since the same variables set anywhere else keep the mail flowing.
An admin enters these once, and the platform injects them as environment variables at deploy time. Your code reads them. It never sees a login screen or an SDK for this.
GRAPH_TENANT_IDGRAPH_CLIENT_IDGRAPH_CLIENT_SECRETMAIL_FROM