Mi da questo errore:
impossibile accedere all'oggetto CDO.Message.

StackTrace:

" at System.Web.Mail.LateBoundAccessHelper.SetProp(Obje ct obj, String propName, Object propValue)
at System.Web.Mail.CdoSysHelper.Send(MailMessage message)
at System.Web.Mail.SmtpMail.Send(MailMessage message)"

InnerException:
Message "Valore non compreso nell'intervallo previsto."
StackTrace
"at System.Web.Mail.LateBoundAccessHelper.SetProp(Type type, Object obj, String propName, Object propValue)
at System.Web.Mail.LateBoundAccessHelper.SetProp(Obje ct obj, String propName, Object propValue)"