PowerShell 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 PowerShell Downloads

PowerShell
Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

#  This example requires the Chilkat API to have been previously unlocked.
#  See Global Unlock Sample for sample code.

$http = New-Object Chilkat.Http

#  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...
$bCrlf = $true
$sbHtmlBody = New-Object Chilkat.StringBuilder
$sbHtmlBody.AppendLine("<html>",$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.
$json = New-Object Chilkat.JsonObject
$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)
$resp = New-Object Chilkat.HttpResponse
$success = $http.HttpJson("POST","https://graph.microsoft.com/v1.0/me/sendMail",$json,"application/json",$resp)
if ($success -eq $false) {
    $($http.LastErrorText)
    exit
}

#  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 -ne 202) {
    $json.Load($resp.BodyStr)
    $json.EmitCompact = $false
    $($json.Emit())
    $("Failed, response status code = " + $resp.StatusCode)
}
else {
    $("Outlook HTML Mail Sent.")
}