Send-HVE

This PowerShell script demonstrates how to send an email using High Volume Email (HVE) and OAuth2 authentication via MailKit.

🔧 Features

• Uses OAuth2 client credentials flow to authenticate with Microsoft identity platform.
• Sends email using MailKit and MimeKit libraries.
• Prompts user for configuration and message details.

🛠 Setup

1. Install MailKit and MimeKit via NuGet or download the DLLs:    - MailKit.dll    - MimeKit.dll

2. Update the script with the correct paths to the DLLs.

3. Ensure the following permissions are granted to your Azure AD app:    - SMTP.Send (Application permission)    - Mail.Send (if using Graph API)

Note: You can download the packages using NuGet:

https://www.nuget.org/packages/MailKit/

⚙️ Required Configuration

The script will prompt for the following:

• Tenant ID
• Client ID
• Client Secret
• Sender (HVE) email address
• Recipient email address
• Email subject
• Email body text

▶️ Example Usage

PS> .\Send-HVE-OAuth2.ps1
Enter your Tenant ID: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
Enter your Client ID: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
Enter your Client Secret: ********************
Enter the HVE sender email address: sender@example.com
Enter the recipient email address: recipient@example.com
Enter the email subject: Test Email
Enter the email body text: This is a test email sent using OAuth2 and MailKit.