To send an email to a recipient group in PowerShell, you can use the Send-MailMessage cmdlet. First, you need to define the recipients of the email by creating an array of email addresses. Then, you can use the Send-MailMessage cmdlet to specify the recipient group, subject, body, and other email details. Make sure to include the SMTP server settings and credentials if required. Once the email is configured, you can run the PowerShell script to send the email to the recipient group.