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Email

Microsoft 365

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.

Before you connect it

01
Create an app registration in the customer’s Entra tenant.
02
Grant it the Mail.Send application permission and admin consent, nothing wider.
03
Add an ApplicationAccessPolicy so it can send only as the one shared mailbox, never as anyone else in the tenant.
04
Generate a client secret and hand it to the platform once. It is never shown again.

What your application receives

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
Microsoft 365’s own docs, from the vendor →
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