Azure Mail sent issue

Question

Azure Mail sent issue

S, Krishnamurthy 0

I am currently developing an application that needs to send emails using the Microsoft Graph API without requiring user interaction. My objective is to authenticate using the client secret and obtain a new access token each time, ensuring that no user sign-in or consent is necessary. I intend to utilize application permissions with the client credentials flow to achieve this functionality and i have only deleget permisison

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Anonymous

2025-04-08T10:34:04.4133333+00:00
Hi S, Krishnamurthy,

To send emails using Microsoft Graph API with the client credentials flow (without user interaction), you need application permissions rather than delegated permissions. Since you are making use of delegated permissions you are getting 403 error.

Application permissions are used for scenarios where the application acts as itself (i.e., not on behalf of a user).

For sending emails without user interaction, you need to use the Mail.Send application permission.

There is no way to use delegated API permission and send mail via client credential flow.

If you want to use delegated API permission then you have to make use of any user interactive flow only.

Make sure to grant admin consent to the Application type API permission:

And now regenerate the access token and you will be able to send mail using client credential flow.

Reference: user: sendMail - Microsoft Graph v1.0 | Microsoft Learn

Hope this helps!

Kindly consider upvoting the comment if the information provided is helpful. This can assist other community members in resolving similar issues.
Anonymous

2025-04-09T08:32:05.8033333+00:00

@S, Krishnamurthy, We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution, please do share that same with the community as it can be helpful to others. Otherwise, please respond with more details and we will try to help.

1 answer

Your answer

Anonymous

2025-04-08T10:34:04.4133333+00:00

Hi S, Krishnamurthy,

To send emails using Microsoft Graph API with the client credentials flow (without user interaction), you need application permissions rather than delegated permissions. Since you are making use of delegated permissions you are getting 403 error.

Application permissions are used for scenarios where the application acts as itself (i.e., not on behalf of a user).

For sending emails without user interaction, you need to use the Mail.Send application permission.

There is no way to use delegated API permission and send mail via client credential flow.

If you want to use delegated API permission then you have to make use of any user interactive flow only.

Make sure to grant admin consent to the Application type API permission:

And now regenerate the access token and you will be able to send mail using client credential flow.

Reference: user: sendMail - Microsoft Graph v1.0 | Microsoft Learn

Hope this helps!

Kindly consider upvoting the comment if the information provided is helpful. This can assist other community members in resolving similar issues.
Anonymous

2025-04-09T08:32:05.8033333+00:00

@S, Krishnamurthy, We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution, please do share that same with the community as it can be helpful to others. Otherwise, please respond with more details and we will try to help.

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