Send mail - Microsoft Graph v1.0 | Microsoft Docs
docs.microsoft.com › en-us › graphNov 15, 2021 · Namespace: microsoft.graph. Send the message specified in the request body using either JSON or MIME format. When using JSON format you can include a file attachment in the same sendMail action call. When using MIME format: Provide the applicable Internet message headers and the MIME content, all encoded in base64 format in the request body.