如何使用Microsoft Graph API获取Office365邮件的MIME内容，以便我可以创建EML文件?
或者有其他的方法来创建邮件的EML文件在Office365中发现使用微软图形API?
我已经尝试使用EWS API，但想使用图形API。
Thanks in advance
目前在Graph或Exchange REST中不支持MIME。使用EWS。
Microsoft Graph有一个返回MimeMessage的API。这是
https://graph.microsoft.com/beta/me/messages/{Id}/$value
您应该用您的消息Id替换Id。然后读取响应作为流，然后加载到MimeMessage。
根据(官方文档)
MIME是一个行业电子邮件标准。许多电子邮件应用程序以MIME格式创建消息，并将其保存在扩展名为. eml的文件中。
尽管Outlook不以MIME格式保存邮件，但有两种方法可以获得MIME格式的Outlook邮件正文:
您可以将
$value段附加到对其进行get-message操作消息。如果邮件附加到Outlook项目或群组帖子，您可以将$value段附加到get-attachment操作中项目或组帖子。
GET /users/{id}/messages/{id}/$value
如果该消息附加到用户邮箱中的另一条消息:
GET /users/{id}/messages/{id}/attachments/{id}/$value
下面是一个请求返回已登录用户邮箱中的消息及其MIME内容的示例。
GET /me/messages/4aade2547798441eab5188a7a2436bc1/$value
以下是响应。MIME内容以MIME- version头开始。
Received: from contoso.com (10.194.241.197) by
contoso.com (10.194.241.197) with Microsoft
SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256) id 15.1.1374.0 via Mailbox
Transport; Mon, 4 Sep 2017 03:00:08 -0700
Received: from contoso.com (10.194.241.197) by
contoso.com (10.194.241.197) with Microsoft
SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256) id 15.1.1374.0; Mon, 4 Sep
2017 03:00:07 -0700
Received: from contoso.com
(fe80::5bf:5059:4ca0:5017) by contoso.com
(fe80::5bf:5059:4ca0:5017%12) with mapi id 15.01.1374.000; Mon, 4 Sep 2017
03:00:01 -0700
From: Administrator <admin@contoso.com>
To: Administrator <admin@contoso.com>
Subject: This email has attachment.
Thread-Topic: This email has attachment.
Thread-Index: AQHTJWSHSywMzSz8o0OJud48nG50GQ==
Date: Mon, 4 Sep 2017 10:00:00 +0000
Message-ID:
<4aade2547798441eab5188a7a2436bc1@contoso.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Exchange-Organization-AuthAs: Internal
X-MS-Exchange-Organization-AuthMechanism: 04
X-MS-Exchange-Organization-AuthSource:
contoso.com
X-MS-Has-Attach: yes
X-MS-Exchange-Organization-Network-Message-Id:
0ffdb402-ec03-42c8-5d32-08d4f37bb517
X-MS-Exchange-Organization-SCL: -1
X-MS-TNEF-Correlator:
X-MS-Exchange-Organization-RecordReviewCfmType: 0
x-ms-publictraffictype: Emai
```http
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="_004_4aade2547798441eab5188a7a2436bc1contoso_"
--_004_4aade2547798441eab5188a7a2436bc1contoso_
Content-Type: multipart/alternative;
boundary="_000_4aade2547798441eab5188a7a2436bc1contoso_"
--_000_4aade2547798441eab5188a7a2436bc1contoso_
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
The attachment is an email.
--_000_4aade2547798441eab5188a7a2436bc1contoso_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style type=3D"text/css" style=3D"display:none;"><!-- P {margin-top:0;margi=
n-bottom:0;} --></style>
</head>
<body dir=3D"ltr">
<div id=3D"divtagdefaultwrapper" style=3D"font-size:12pt;color:#000000;font=
-family:Calibri,Helvetica,sans-serif;" dir=3D"ltr">
<p>The attachment is an email.</p>
</div>
</body>
</html>
--_000_4aade2547798441eab5188a7a2436bc1contoso_--
--_004_4aade2547798441eab5188a7a2436bc1contoso_
Content-Type: application/octet-stream; name="Attachment email.eml"
Content-Description: Attachment email.eml
Content-Disposition: attachment; filename="Attachment email.eml"; size=408;
creation-date="Mon, 04 Sep 2017 09:59:43 GMT";
modification-date="Mon, 04 Sep 2017 09:59:43 GMT"
Content-Transfer-Encoding: base64
RnJvbToJQWRtaW5pc3RyYXRvciA8YWRtaW5AdGVuYW50LUVYSEItMTQ3MS5jb20+DQpTZW50OglN
b25kYXksIFNlcHRlbWJlciA0LCAyMDE3IDM6MjYgUE0NClRvOglTcml2YXJkaGFuIEhlYmJhcg0K
U3ViamVjdDoJQXR0YWNobWVudCBlbWFpbA0KDQpJIHdpbGwgYXR0YWNoIHRoaXMgZW1haWwgdG8g
YW5vdGhlciBtYWlsLg0K
--_004_4aade2547798441eab5188a7a2436bc1contoso_--