The message was not sent.
System.InvalidOperationException: A recipient must be specified.
   at System.Net.Mail.SmtpClient.Send(MailMessage message)
   at Dynamicweb.EmailHandler.SaveMail(String saveFolder, MailMessage mailObj, Boolean returnFileName)
   at Dynamicweb.EmailHandler.Send(MailMessage mailMessage, Boolean logging, Boolean throwException)
   at Dynamicweb.Admin.FormMailer.SendMail()