Email CC's when test email is set

As a quick POC, I simply modified the EmailService's CheckTestMode method as follows. Either Opti building something similar OR allowing partners to somehow inject their own logic here would be beneficial:

        internal void CheckTestMode(string emailTestAddress, MailMessage mailMessage)
        {
            if (!emailTestAddress.IsBlank())
            {
                // <NewFeature>
                if (mailMessage.IsBodyHtml)
                {
                    var content = $"<table><tr><td>TO</td><td>{string.Join(",", mailMessage.To)}</td><tr>" +
                                  $"<tr><td>CC</td><td>{string.Join(",", mailMessage.CC)}</td></tr>" +
                                  $"<tr><td>BCC</td><td>{string.Join(",", mailMessage.Bcc)}</td></tr></table></body>";
                    mailMessage.Body = mailMessage.Body.Replace("</body>", content);
                }
                else
                {
                    mailMessage.Body = $"\n\n==========================\n" +
                                       $"TO: {string.Join(",", mailMessage.To)}\n" +
                                       $"CC: {string.Join(",", mailMessage.CC)}\n" +
                                       $"BCC: {string.Join(",", mailMessage.Bcc)}\n";
                }
                // </NewFeature>

                mailMessage.To.Clear();
                mailMessage.CC.Clear();
                mailMessage.Bcc.Clear();
                mailMessage.To.Add(emailTestAddress);
            }
        }

Thank you for submitting this request! Our team is currently reviewing if and how we may implement this, particularly with consideration of our wide client base. We will update this ticket once we have completed this investigation.

I agree with this. Too often it is asked "how do we know the correct CC emails are being added when the Test Email setting is on?" It would be awesome if the "original" email addresses showed at the bottom of the email.