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Update README. MS365 #116

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Update README. MS365 #116

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Update README
Oct 23, 2025
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Oct 23, 2025
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Expand Up @@ -44,6 +44,29 @@ subject = Default SMTP Subject
> * SMTP **supports** attachments and will include them in the outbound message.
> * MS365 **ignores** attachments (you’ll see a warning in the logs if you pass any).
> * All email templates must live under `/Templates/Email/`.
> * If both SMTP and MS365 are configured, SMTP will be used as the default mail transport.

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### ⚙️ How Microsoft 365 Email Works

When **MS365** is configured, Iris sends emails through the **Microsoft Graph API** instead of SMTP.
It uses **OAuth2 client-credentials flow** to authenticate using your Azure app credentials.

**Flow summary:**

1. Reads the `[m365_email]` configuration.
2. Initializes an MSAL client with your `tenant_id`, `client_id`, and `client_secret`.
3. Obtains an access token for the scope `https://graph.microsoft.com/.default`.
4. Sends the message via `POST https://graph.microsoft.com/v1.0/users/{user_email}/sendMail`.
5. Supports HTML body, CC/BCC, and inline base64-encoded attachments.

**Transport selection logic:**

* If **only `[m365_email]`** is configured → MS365 is used.
* If **only `[smtp]`** is configured → SMTP is used.
* If **both** are configured → **SMTP takes priority** and will be used as the default transport.
* If **neither** is configured → the `/send_email` API returns `400 Email service not configured.`

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