Sending E-Mails using Microsoft 365 via SMTP

To send emails from your Azure-hosted PHP application using Microsoft 365, follow these simple steps using Microsoft Graph API:

1. Register Your Application in Azure

• Go to Azure Portal: Visit Azure Portal.
• Create an App Registration:
  • Navigate to Azure Active Directory > App registrations.
  • Click New registration and follow the prompts to create an application.
  • Save the Application (client) ID and Directory (tenant) ID that you get.

2. Set Up API Permissions

• Add Permissions:
  • In your app registration, go to API permissions > Add a permission.
  • Choose Microsoft Graph > Delegated permissions.
  • Add Mail.Send to allow sending emails.

3. Generate a Client Secret

• Create a Secret:
  • Go to Certificates & secrets > New client secret.
  • Describe the secret and set an expiration time.
  • Click Add and save the secret value. This is your password.

4. Get an Access Token

• Request an Access Token:
  • Make a POST request to the token URL:

        POST https://login.microsoftonline.com/{tenant}/oauth2/v2.0/token
    

  • Use these parameters in your request:

        grant_type=client_credentials
        client_id={client_id}
        client_secret={client_secret}
        scope=https://graph.microsoft.com/.default
    

  • The response will include an access token you’ll use for authentication.

5. Send an Email

• Use Microsoft Graph API:
  • Make a POST request to:

        POST https://graph.microsoft.com/v1.0/me/sendMail
    

  • Include the access token in the Authorization header:

        Authorization: Bearer {access_token}
    

  • Send the email content in JSON format:

        {
          "message": {
            "subject": "Test Email",
            "body": {
              "contentType": "Text",
              "content": "This is a test email."
            },
            "toRecipients": [
              {
                "emailAddress": {
                  "address": "recipient@example.com"
                }
              }
            ]
          }
        }