var mailman = new MimeMessage();


    var client = new SmtpClient();

   //SMTP Credentials here.

    //  Create a new email object
    mailman.From.Add(new MailboxAddress(message.FromAddress, message.FromAddress));
    mailman.To.Add(new MailboxAddress(message.ToAddress, message.ToAddress));
    mailman.Subject = message.MailSubject;

    var builder = new BodyBuilder();

    builder.HtmlBody = string.Format(message.Content);

    mailman.Body = builder.ToMessageBody();

    client.Send(mailman);