Microsoft 365 Email: not possible to set custom sender name

Question

Hi!

I am trying to send a message by POST /me/sendMail endpoint: https://learn.microsoft.com/uk-ua/graph/api/user-sendmail?view=graph-rest-1.0&tabs=http

My request body looks like this:

{
    "message": {
        "body": {
            "content": "test content",
            "contentType": "html"
        },
        "from": {
            "emailAddress": {
                "address": "dmytro.maliuta@mail.com",
                "name": "Test sender"
            }
        },
        "subject": "test subject",
        "toRecipients": [
            {
                "emailAddress": {
                    "address": "john.doe@mail.com"
                }
            }
        ]
    }
}

As you can see I have a custom sender name in the from object (message.from.emailAddress.name), but when I send a message the sender name is not the same as I have in the request body. Is it an error on Microsoft's side? Can someone help with this?

Answer 1

Hi @Dmytro Maliuta

This is not an error. According to the documentation, the from property indicates the owner of the mailbox from which the message was sent. The value must correspond to the mailbox actually used. This value cannot be changed in most cases, even if you customize it when sending the request, except in sharing or delegation scenarios.

If you need to set the sender details of the message, you need to follow the following scenario:

See the link below for more details:

https://learn.microsoft.com/en-us/graph/api/resources/message?view=graph-rest-1.0#properties

https://learn.microsoft.com/en-us/graph/outlook-create-send-messages#set-the-from-and-sender-properties

Hope this helps.

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