Sending an email via an HTTP REST call to Microsoft.Graph comes out with an error

Question

Hello,

In a UWP application, I am trying to send an email via an HTTP REST call to Microsoft.Graph, at the URL “https://graph.microsoft.com/v1.0/me/sendMail”.

For this application, I have Mail.Send permission (Send mail as a user).
For the call, we C# code is:

using (HttpClient client = new HttpClient())
{
client. DefaultRequestHeaders.Add(“Authorization”, "Bearer " + token);
HttpResponseMessage response = await client. PostAsync(url, content);
}

According to the documentation (https://learn.microsoft.com/en-us/graph/api/user-sendmail?view=graph-rest-1.0&tabs=http), the JSON sent is:

{
“Body”: {
“Content”: “My message”,
“ContentType”: “HTML”
},
“Subject”: “simple message”,
“From”: {
“EmailAddress”: {
“Address”: [Redacted]@[Redacted]
}
},
“ToRecipients”: [{
“EmailAddress”: {
“Address”: [Redacted]@[Redacted]
}
}],
“HasAttachments”: false,
“Importance”: “Low”
}

The response received is:

StatusCode: 400, ReasonPhrase: ‘Bad Request’

I tried removing the “From” from the JSON and that doesn’t fix the problem.

It’s surprising that this doesn’t work, because in the same environment going through the Microsoft.Graph Nuget package and through the code:

await graphClient.Me.SendMail(message, true). Request(). PostAsync();

Sending emails works perfectly!

Best regards.

Answer 1

The right solution is to add "message" and not put a "from" sender!

Sample :

{
    "message": {
        "body": {
            "content": "my message",
            "contentType": "HTML"
        },
        "subject": "my subject",
        "toRecipients": [{
            "emailAddress": {
                "address": "******@outlook.com"
            }
        }],
        "hasAttachments": false,
        "importance": "Normal"
    }
}

Answer 2

Hi @COM-ADD

Yes, you are correct, the right solution is not to use 'from' within message.
None of the examples in the official docs has this attribute-https://learn.microsoft.com/en-us/graph/api/user-sendmail?view=graph-rest-1.0&tabs=http

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