send-email.ps1

# Configuration
#$clientId = "80af6542-67be-49fe-8b06-d574e318fe78"          # Replace with your client ID from Azure Portal
$clientId = "7c98abdd-386f-4aa8-881d-608edf021971" # tolle-aap_2024-02-05_unrestricted
# $clientSecret = "7lD8Q~TST16s1aZcC84O5hchtuO5AhzQSjl9gcqp"  # Replace with your client secret from Azure Portal
$clientSecret = ".Cu8Q~T89P6JlSEye63FNsoLspLTPWSb0B3MJcQ"
$tenantId = "12f488e2-8612-483f-ac92-10d86b99f9e3"          # Replace with your tenant ID
$recipientEmail = "[email protected]"  # Replace with the recipient's email address
# $fromEmail = "[email protected]" 
$userId = "3cf384a6-a354-44e1-9f96-01e843c50945" # tolle-aap- user
$fromEmail = "[email protected]"
$fromEmail = "[email protected]" # M365 Group Mailbox
$userId = "13d1ab7d-45f4-4712-9476-b0c8bd7bc0c3" #Adelev
# $userPrincipalName = $fromEmail

$tokenEndpoint = "https://login.microsoftonline.com/$tenantId/oauth2/v2.0/token"
$body = @{
    grant_type    = "client_credentials"
    client_id     = $clientId
    client_secret = $clientSecret
    scope         = "https://graph.microsoft.com/.default"
}

$response = Invoke-RestMethod -Uri $tokenEndpoint -Method Post -Body $body
$accessToken = $response.access_token

# Compose the email subject and body
$subject = "Test Email from PowerShell" + $(get-date).Ticks
$body = "This is a test email sent from PowerShell using Microsoft Graph API."
#$sender = $fromEmail
$graphApiEndpoint = "https://graph.microsoft.com/v1.0/users/$userId/sendMail"
$headers = @{
    Authorization  = "Bearer $accessToken"
    "Content-Type" = "application/json"
}

$emailData = @{
    message = @{
        subject      = $subject
        body         = @{
            contentType = "Text"
            content     = $body
        }
        toRecipients = @(
            @{
                emailAddress = @{
                    address = $recipientEmail
                }
            }
        )
        
        from         = @{
            emailAddress = @{
                address = $fromEmail
            }
        }
        
    }
}


$emailJson = $emailData | ConvertTo-Json -Depth 100

Invoke-RestMethod -Uri $graphApiEndpoint -Method Post -Headers $headers -Body $emailJson -ContentType "application/json"

steps.ps1

# create a licensed user in admin.microsoft.com
# create a mail enabled security group in exchange admin
# add the licensed user as member of the group
# create a new app reg with Mail.Send perms

New-ApplicationAccessPolicy -AppId 80af6542-67be-49fe-8b06-d574e318fe78 -PolicyScopeGroupId tolle-aap_2024-02-05-group@takana17.onmicrosoft.com -AccessRight RestrictAccess -Description "Restrict this app to members of distribution group Tolle AAP."

# outputs "granted"
Test-ApplicationAccessPolicy -Identity tolle-aap_2024-02-05_user@takana17.onmicrosoft.com -AppId 80af6542-67be-49fe-8b06-d574e318fe78