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mailFolder: importMime

Namespace: microsoft.graph

Important

APIs under the /beta version in Microsoft Graph are subject to change. Use of these APIs in production applications is not supported. To determine whether an API is available in v1.0, use the Version selector.

Create a non-draft message in a mailFolder directly from MIME content, without submitting it to transport.

Unlike creating a message, which always creates a draft, this action creates the message in a final, non-draft state. The message appears in the destination folder as if it was delivered; however, it doesn't go through transport, isn't stamped as sent, and never appears in the Sent Items folder. The action preserves the full MIME content, including internet message headers, body parts, and attachments.

Permissions

Choose the permission or permissions marked as least privileged for this API. Use a higher privileged permission or permissions only if your app requires it. For details about delegated and application permissions, see Permission types. To learn more about these permissions, see the permissions reference.

Permission type Least privileged permissions Higher privileged permissions
Delegated (work or school account) Mail-Advanced.ReadWrite Not available.
Delegated (personal Microsoft account) Not supported. Not supported.
Application Mail-Advanced.ReadWrite.All Not available.

HTTP request

POST /me/mailFolders/{mailFolderId}/importMime
POST /users/{usersId}/mailFolders/{mailFolderId}/importMime

Note: The {mailFolderId} can be a folder ID or a well-known folder name such as inbox.

Request headers

Name Description
Authorization Bearer {token}. Required. Learn more about authentication and authorization.
Content-Type text/plain. Required.

Request body

In the request body, supply the MIME content of the message. Provide the applicable Internet message headers and the MIME content, all Base64-encoded.

The entire request body is the Base64-encoded MIME content, with no JSON envelope or parameters. This API doesn't support editing or updating MIME properties individually.

Response

If successful, this action returns a 201 Created response code and a message object in the response body. The returned message has isDraft set to false.

If the request body includes malformed MIME content, this action returns a 400 Bad Request response code and the following error message: Invalid base64 string for MIME content.

Examples

Request

The following example shows a request. The request body is the Base64-encoded MIME content, shortened for readability.

POST https://graph.microsoft.com/beta/me/mailFolders/inbox/importMime
Content-type: text/plain

RnJvbTogY29udG9zby1hbGVydHNAY29udG9zby5jb20NClRvOiB0ZXN0aW5nQGNvbnRvc28uY29t
DQpTdWJqZWN0OiBRdWFydGVybHkgcmVwb3J0DQpEYXRlOiBUaHUsIDI1IEp1biAyMDI2IDEwOjAw
OjAwIC0wNzAwDQpDb250ZW50LVR5cGU6IHRleHQvcGxhaW47IGNoYXJzZXQ9InV0Zi04Ig0KDQpC
b2R5IG9mIHRoZSBpbXBvcnRlZCBtZXNzYWdlLg==

Response

The following example shows the response.

Note: The response object shown here might be shortened for readability.

HTTP/1.1 201 Created
Content-type: application/json

{
  "@odata.context": "https://graph.microsoft.com/beta/$metadata#users('02d1914d-7abd-4621-a407-57b8bdeb1ada')/messages/$entity",
  "id": "AAMkADE5MWM0YmM5LThjOWUtNGFhZi1hOTBhLWNmZDBiZDhhNTljMABGAAAA",
  "createdDateTime": "2026-09-17T21:30:19Z",
  "lastModifiedDateTime": "2026-09-17T21:30:20Z",
  "receivedDateTime": "2026-09-17T21:30:20Z",
  "sentDateTime": "2026-07-24T20:03:00Z",
  "hasAttachments": false,
  "subject": "Quarterly report",
  "isRead": false,
  "isDraft": false,
  "parentFolderId": "AAMkADE5MWM0YmM5LThjOWUtNGFhZi1hOTBhLWNmZDBiZDhhNTljMAAuAAAA"
}
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