Download Email Attachment Using Graph Api ((install))

: Required if you plan to mark emails as read or move them to an archive folder after downloading. 2. Locate the Message ID

To start, you must register an application in the Microsoft Entra admin center and grant it the necessary API permissions.

For larger files or a more direct stream, you can append /$value to the attachment URL. This returns the raw binary data directly, bypassing the need for base64 decoding. download email attachment using graph api

: Allows the app to read emails in the signed-in user's mailbox.

: (For service apps) Allows the app to read basic properties of all mailboxes without a user present. : Required if you plan to mark emails

This is the standard approach. You fetch the attachment object, which contains the contentBytes property— a base64-encoded string of the file.

The process follows three main steps: authenticating with Microsoft Entra ID (formerly Azure AD), locating the email message, and finally retrieving the attachment’s raw data. 1. Prerequisites and Permissions For larger files or a more direct stream,

GET /me/messages/{message-id}/attachments/{attachment-id} Python Example:

Using the to download email attachments is the most efficient and scalable way to automate mailbox processing in Office 365. Unlike legacy protocols like IMAP or POP3, the Graph API offers a unified, secure, and performant RESTful interface for accessing Outlook data.

download attachments from mail using microsoft graph rest api