How to identify original recipient using when email delievery failes using Microsoft exchange webserivces

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C#

MVC

I am pulling inbox of email sender using microsoft exchange webservices. I am getting subject, from, Torecipient etc. Now I want Original recipient to whom mail was not delievered. How do I get that?

What I have tried:

//Connectd to exchange service using

exchange = new ExchangeService(ExchangeVersion.Exchange2007_SP1);

exchange.Credentials = new WebCredentials(emailAddress, password,domainname)
exchange.AutodiscoverUrl(emailAddrsss)
 string searchstring = "Undeliverable:";
                SearchFilter.ContainsSubstring filter = new SearchFilter.ContainsSubstring(EmailMessageSchema.Subject, searchstring);
 if (exchange != null)
                {
                    FindItemsResults<item> findResults = exchange.FindItems(WellKnownFolderName.Inbox, filter, new ItemView(5));

                    foreach (Item item in findResults)
                    {

                        EmailMessage message = EmailMessage.Bind(exchange, item.Id);                     
                        var subjct = message.Subject;
                        var fromAddress = message.From.Address;
                        var fromName = message.From.Name;
                        var to = message.ToRecipients;
}