read email using exchange web services

user_994432 0
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This is my scenario: I have to read email from exchange 2010 sp2 accounts. I have to use Exchange Web Services, POP3 and IMAP are blocked. I have to test my app in an environment where people can access their accounts through a web browser only in the intranet. I can't debug my app directly to this intranet. I have this snippet to access an account:

private void Dowork()
{
    ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP2);

    string dominio = "domain";
    string usuario = "user";
    string password = "password";

    service.Credentials = new NetworkCredential(usuario, password, dominio);

    string url = usuario + "@" + dominio + ".com";

    service.AutodiscoverUrl(url, RedirectionUrlValidationCallback);
    //service.AutodiscoverUrl(url);

    FindItemsResults<Item> findResults = service.FindItems(
       WellKnownFolderName.Inbox,
       new ItemView(10));

    string content = string.Empty;

    foreach (Item item in findResults.Items)
    {
        EmailMessage email = EmailMessage.Bind(service, item.Id);
        email.Load();

        content += item.Subject + "\n";
        content += email.From.Address + "\n";
        content += email.Body + "\n\n";

        //Console.WriteLine(item.Subject);
        //Console.WriteLine(email.From.Address);
        //Console.WriteLine(email.Body);
    }

    string result = content;
}

// Create the callback to validate the redirection URL.
static bool RedirectionUrlValidationCallback(String redirectionUrl)
{
    // Perform validation.
    return (redirectionUrl == "https://autodiscover-s.outlook.com/autodiscover/autodiscover.xml");
}

If I use this line:

service.AutodiscoverUrl(url);

I get this error:

"Autodiscover blocked a potentially insecure redirection to https://autodiscover.colpatria.com/autodiscover/autodiscover.xml. To allow Autodiscover to follow the redirection, use the AutodiscoverUrl(string, AutodiscoverRedirectionUrlValidationCallback) overload."

So the method RedirectionUrlValidationCallback was implemented, I'm not sure if the url is right. The fact is I'm getting this error:

"The Autodiscover service couldn't be located".

Is possible that Autodiscover is not configured properly?? I'm not the exchange administrator, how can I know if autodiscover works?? I need arguments to tell exchange administrators this feature must be configured. Thanks for any help.

exchange-server-2010 exchangewebservices email
6 Answers

When you used AutodiscoverUrl() with RedirectionUrlValidationCallback, here is a sample code:

ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1);
service.PreAuthenticate = true;
service.Credentials = new WebCredentials("my_username","my_password"); //use WebCredentials instead of NetworkCredential
service.AutodiscoverUrl(userEmailAddress, RedirectionCallback);

And RedirectionCallback method be like:

        static bool RedirectionCallback(string url)
        {
            bool redirectionValidated = false;
            Uri redirectionUri = new Uri(url);

//There are two ways of implementing a RedirectionCallback scheme

// Way 1: Return true if the URL is an HTTPS URL.
            //return url.ToLower().StartsWith("https://");
            if (redirectionUri.Scheme == "https")
                redirectionValidated = true;

//Way 2: check if url is autodiscovery url
            if (url.Equals(
                "https://autodiscover-s.outlook.com/autodiscover/autodiscover.xml"))
                redirectionValidated = true;

            return redirectionValidated;
        }

PS: Take care of proxies disallowing Autodiscovery service. In my case, this code everytime returned "The Autodiscovery service cannot be located" error, but the root cause was 403 Forbidden on Autodiscovery call. It did work after proxy settings.

user_71881230
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