Generating Reply Email via MSGraph PHP SDK

DinosaurHunter :

I am rebuilding an EWS-based system to use the Microsoft Graph REST API and I am having trouble replicating the Reply Email functionality as I had in the EWS implementation.

With EWS I would create a ReplyToItemType, specify the original email and attach the NewBodyContent like so:

$reply = new ReplyToItemType();

$reply->ReferenceItemId = new ItemIdType();
$reply->ReferenceItemId->Id = $this->message->ItemId->Id;
$reply->ReferenceItemId->ChangeKey = $this->message->ItemId->ChangeKey;

$reply->NewBodyContent = new BodyType();
$reply->NewBodyContent->BodyType = BodyTypeType::HTML;
$reply->NewBodyContent->_ = $this->body;

This would create a new message with the content of the previous email already attached and set the subject (i.e. "RE: original subject")

With MSGraph, I don't seem to be able to replicate this functionality...

I am using the POST /users/{id | userPrincipalName}/messages/{id}/reply endpoint (so specifies the message to reply to in the URL):

$this->graph = new Graph();
$this->graph->setAccessToken($token);

$graphRequest = $this->graph->createRequest(
    'POST', '/users/' . $mailbox . '/messages/' . $exchange_id . '/reply'
);

$graphRequest->attachBody($body)->execute();

The request body, $body, looks like:

array:1 [
  "Message" => array:6 [
    "sender" => array:1 [
      "emailAddress" => array:1 [
        "address" => "[email protected]"
      ]
    ]
    "toRecipients" => array:1 [
      0 => array:1 [
        "emailAddress" => array:1 [
          "address" => "[email protected]"
        ]
      ]
    ]
    "ccRecipients" => []
    "attachments" => []
    "body" => array:2 [
      "contentType" => "html"
      "content" => "<p>Test</p>"
    ]
    "subject" => "null"
  ]
]

But that sends an email with a subject "null" and with the content:

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
    </head>
    <body>
        <p>test</p>
    </body>
</html>

Is there any way of replicating the EWS functionality as above, without having to attach the previous email content and subject manually?

Josh :

Instead of constructing a message object, you're going to want to use the comment property instead. Set it to a text string and it will become the top part of the reply message, with the quoted text from the original message appearing underneath as you would expect.