Dart Requires Chilkat v11.0.0+
Outlook Send HTML Email

This example sends an HTML email. Other examples exist for:
Sending plain-text email.
Sending HTML email with embedded images.
Sending email with attachments.
Sending HTML email with embedded images and attachments.
Chilkat Dart Downloads

Dart
import 'package:chilkat/chilkat.dart';

void main() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final http = CkHttp();

  // Use your previously obtained access token here:
  // See the following examples for getting an access token:
  //    Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
  //    Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
  //    Refresh Access Token (Azure AD v2.0 Endpoint).
  //    Refresh Access Token (Azure AD Endpoint).

  http.authToken = 'MICROSOFT_GRAPH_ACCESS_TOKEN';

  // To send mail, we'll POST to the following endpoint:
  // 
  // POST /users/{id | userPrincipalName}/sendMail
  // 
  // (The special keyword "me" may be used in place of a principal name.)
  // 

  // This example will send HTML email containing the following HTML body:

  // 	<html>
  // 	<head>
  // 	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  // 	<meta content="text/html; charset=utf-8">
  // 	</head>
  // 	<body bgcolor="#FFFFFF">
  // 	<font face="Calibri">This is a test <b>HTML email</b>.<br>
  // 	</font>
  // 	</body>
  // 	</html>

  // Build the HTML body...
  final bCrlf = true;
  final sbHtmlBody = CkStringBuilder();
  sbHtmlBody.appendLine('<html>', bCrlf);
  sbHtmlBody.appendLine('<head>', bCrlf);
  sbHtmlBody.appendLine('<meta http-equiv="Content-Type" content="text/html; charset=utf-8">', bCrlf);
  sbHtmlBody.appendLine('<meta content="text/html; charset=utf-8">', bCrlf);
  sbHtmlBody.appendLine('</head>', bCrlf);
  sbHtmlBody.appendLine('<body bgcolor="#FFFFFF">', bCrlf);
  sbHtmlBody.appendLine('<font face="Calibri">This is a test <b>HTML email</b>.<br>', bCrlf);
  sbHtmlBody.appendLine('</font>', bCrlf);
  sbHtmlBody.appendLine('</body>', bCrlf);
  sbHtmlBody.appendLine('</html>', bCrlf);

  // The body of the POST request contains JSON that specifies the email subject, body,
  // recipients, etc.  This example will build the following JSON HTML email:
  // 

  // 	{
  // 	  "message": {
  // 	    "subject": "Sample HTML Email",
  // 	    "body": {
  // 	      "contentType": "html",
  // 	      "content": "The HTML body goes here..."
  // 	    },
  // 	    "toRecipients": [
  // 	      {
  // 	        "emailAddress": {
  // 		  "name": "Chilkat Software",
  // 	          "address": "admin@chilkat.io"
  // 	        }
  // 	      },
  // 	      {
  // 	        "emailAddress": {
  // 	          "address": "chilkat.support@gmail.com"
  // 	        }
  // 	      }
  // 	    ],
  // 	    "ccRecipients": [
  // 	      {
  // 	        "emailAddress": {
  // 		  "name": "Chilkat Blog",
  // 		  "address": "admin@cknotes.com"
  // 	        }
  // 	      }
  // 	    ]
  // 	  },
  // 	  "saveToSentItems": true
  // 	}
  // 

  // Build the above JSON.
  final json = CkJsonObject();
  json.updateString('message.subject', 'Sample HTML email');
  json.updateString('message.body.contentType', 'html');
  json.updateString('message.body.content', sbHtmlBody.getAsString());
  json.updateString('message.toRecipients[0].emailAddress.name', 'Chilkat Software');
  json.updateString('message.toRecipients[0].emailAddress.address', 'admin@chilkat.io');
  json.updateString('message.toRecipients[1].emailAddress.address', 'chilkat.support@gmail.com');
  json.updateString('message.ccRecipients[0].emailAddress.name', 'Chilkat Blog');
  json.updateString('message.ccRecipients[0].emailAddress.address', 'admin@cknotes.com');
  json.updateBool('saveToSentItems', true);

  // Send the HTTP POST (i.e. send the HTML email)
  final resp = CkHttpResponse();
  try {
    http.httpJson('POST', 'https://graph.microsoft.com/v1.0/me/sendMail', json, 'application/json', resp);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // The send succeeded if the response status code = 202.
  // In the success case, there is no response body.  (We just get the response code to know that it succeeded.)
  if (resp.statusCode != 202) {
    json.load(resp.bodyStr);
    json.emitCompact = false;
    print(json.emit());
    print('Failed, response status code = ${resp.statusCode}');
  } else {
    print('Outlook HTML Mail Sent.');
  }
}