Why do I get "No mailbox with such guid."

Question

_{Thursday, June 15, 2017 12:36 PM}

I am trying to send email using the Exchange Web Service from a .Net Web API solution.

My solution is using ASPNet Identity Mixed Authentication, with which I configured the EWS to user DefaultCredentials.  I received "No mailbox with such guid".

I can user a dedicated Username and password by assigning the credentials and it does work.

I can use defaultcredentials on my local (domain) development machine, but when I deploy the solution it returns the error.

To test it I created a simple Application using ONLY Windows Authentication, with a Web Api method to send a test email, using defaultcredentials.

This is the EwsResponse...

<Trace Tag="EwsResponse" Tid="127" Time="2017-06-15 12:23:55Z" Version="15.00.0913.015">
  <?xml version="1.0" encoding="utf-8"?>
  <s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
    <s:Header>
      <h:ServerVersionInfo MajorVersion="15" MinorVersion="1" MajorBuildNumber="845" MinorBuildNumber="34" Version="V2016_10_10" xmlns:h="http://schemas.microsoft.com/exchange/services/2006/types" xmlns="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" />
    </s:Header>
    <s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
      <m:CreateItemResponse xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
        <m:ResponseMessages>
          <m:CreateItemResponseMessage ResponseClass="Error">
            <m:MessageText>No mailbox with such guid.</m:MessageText>
            <m:ResponseCode>ErrorNonExistentMailbox</m:ResponseCode>
            <m:DescriptiveLinkKey>0</m:DescriptiveLinkKey>
            <m:MessageXml>
              <t:Value Name="MailboxGuid">S-1-5-21-137024685-2204166116-4157399963-374383</t:Value>
            </m:MessageXml>
            <m:Items />
          </m:CreateItemResponseMessage>
        </m:ResponseMessages>
      </m:CreateItemResponse>
    </s:Body>
  </s:Envelope>
</Trace>

Any clues? 

Thanks.

All replies (3)

_{Thursday, June 15, 2017 12:39 PM}

Here is my simple method to send the email...

        public HttpResponseMessage Get() {
            try
            {
                Trace.WriteLine($"User: {User.Identity.Name}");

                var exchangeService = new ExchangeService(ExchangeVersion.Exchange2013_SP1);

                var url = @"https://autodiscover.domain.ac.uk/ews/exchange.asmx";

                exchangeService.Url = new Uri(url);
                exchangeService.UseDefaultCredentials = true;

                exchangeService.TraceEnabled = true;
                exchangeService.TraceEnablePrettyPrinting = true;
                exchangeService.TraceFlags = TraceFlags.All;
                exchangeService.TraceListener = new TraceListener();

                var subject = "This is a test message for the exchange web service";
                var emailMessage = new EmailMessage(exchangeService);
                emailMessage.Subject = subject;
                emailMessage.Body = subject;

                emailMessage.ToRecipients.Add(new EmailAddress("[email protected]"));

                emailMessage.SendAndSaveCopy(WellKnownFolderName.SentItems);

                return Request.CreateResponse(HttpStatusCode.OK);
            }
            catch(Exception ex) {
                Trace.WriteLine(ex);
                throw;
            }
        }

_{Thursday, June 15, 2017 2:16 PM}

A little further information...

The "MailboxGuid" (S-1-5-21-137024685-2204166116-4157399963-374383) is actually the SID of the IIS Server that is running the Website.

I have no idea why EWS is using that ID.

_{Friday, June 16, 2017 5:46 AM}

You have used

exchangeService.UseDefaultCredentials = true;

If your using Impersonation in IIS you need to ensure Kerberos delegation is also configured see https://blogs.msdn.microsoft.com/emeamsgdev/2012/11/05/ews-from-a-web-application-using-windows-authentication-and-impersonation/ which has an example and explanation of what is needed.

Cheers
Glen