Exchange Web Services (EWS) API “To” header for alias

Question

I have an inbox set up in exchange, hello@mycompany.com

Additionally, there is an alias for this, news@mycompany.com

Answer 1

This works for me:

    private static string GetToAddress()
    {
        ExchangeService exService = new ExchangeService();
        exService.Credentials = new NetworkCredential("username", "password", "domain");
        exService.Url = new Uri("https://youraddress/EWS/Exchange.asmx");

        ExtendedPropertyDefinition PR_TRANSPORT_MESSAGE_HEADERS = new ExtendedPropertyDefinition(0x007D,MapiPropertyType.String);
        PropertySet psPropSet = new PropertySet(BasePropertySet.FirstClassProperties)
                                    {PR_TRANSPORT_MESSAGE_HEADERS, ItemSchema.MimeContent};

        FindItemsResults<Item> fiResults = exService.FindItems(WellKnownFolderName.Inbox, new ItemView(1));
        foreach (Item itItem in fiResults.Items)
        {
            itItem.Load(psPropSet);
            Object valHeaders;
            if (itItem.TryGetProperty(PR_TRANSPORT_MESSAGE_HEADERS, out valHeaders))
            {
                Regex regex = new Regex(@"To:.*<(.+)>");
                Match match = regex.Match(valHeaders.ToString());
                if (match.Groups.Count == 2)
                    return match.Groups[1].Value;
            }
            return ToAddress;
        }
        return "Cannot find ToAddress";
    }

The code is from: http://social.technet.microsoft.com/Forums/en-au/exchangesvrdevelopment/thread/1e5bbde0-218e-466e-afcc-cb60bc2ba692