Connecting to Exchange Server

In order to connect to Exchange servers 2007, 2010 and 2013 using Exchange Web Service, Aspose.Email provides the IEWSClient interface that implements the EWSClient class. The EWSClient.GetEWSClient method instantiates and returns an IEWSClient object that is further used to perform operations related to an Exchange mailbox and other folders. This article shows how to instantiate objects of IEWSClient.

Connecting to Exchange Server using EWS

The following code snippet shows you how to connect using Exchange Web Service (EWS).

// For complete examples and data files, please go to https://github.com/aspose-email/Aspose.Email-for-.NET
private static IEWSClient GetExchangeEWSClient()
{
    const string mailboxUri = "https://outlook.office365.com/ews/exchange.asmx";
    const string domain = @"";
    const string username = @"[e-mail]";
    const string password = @"password";
    NetworkCredential credentials = new NetworkCredential(username, password, domain);
    IEWSClient client = EWSClient.GetEWSClient(mailboxUri, credentials);
    return client;
}

Connecting to Exchange Server using IMAP

Microsoft Exchange Server supports the IMAP protocol for accessing items in a mailbox. Use Aspose.Email ImapClient class to connect to the Exchange Server using the IMAP protocol. For more information about the ImapClient class. First, make sure that IMAP services are enabled for your Exchange Server:

1. Open the Control Panel.
2. Go to Administrator Tools, then Services.
3. Check the status of the Microsoft Exchange IMAP4 service.
4. If it is not already running, enable/start it.

The following code snippet shows you how to connect and list messages from the Inbox folder of Microsoft exchange server using IMAP protocol.

// For complete examples and data files, please go to https://github.com/aspose-email/Aspose.Email-for-.NET
// Connect to Exchange Server using ImapClient class
ImapClient imapClient = new ImapClient("ex07sp1", "Administrator", "Evaluation1");
imapClient.SecurityOptions = SecurityOptions.Auto;

// Select the Inbox folder
imapClient.SelectFolder(ImapFolderInfo.InBox);

// Get the list of messages
ImapMessageInfoCollection msgCollection = imapClient.ListMessages();
foreach (ImapMessageInfo msgInfo in msgCollection)
{
    Console.WriteLine(msgInfo.Subject);
}
// Disconnect from the server
imapClient.Dispose();

The following code snippet shows you how to use SSL.

// For complete examples and data files, please go to https://github.com/aspose-email/Aspose.Email-for-.NET
public static void Run()
{            
    // Connect to Exchange Server using ImapClient class
    ImapClient imapClient = new ImapClient("ex07sp1", 993, "Administrator", "Evaluation1", new RemoteCertificateValidationCallback(RemoteCertificateValidationHandler));
    imapClient.SecurityOptions = SecurityOptions.SSLExplicit;

    // Select the Inbox folder
    imapClient.SelectFolder(ImapFolderInfo.InBox);

    // Get the list of messages
    ImapMessageInfoCollection msgCollection = imapClient.ListMessages();
    foreach (ImapMessageInfo msgInfo in msgCollection)
    {
        Console.WriteLine(msgInfo.Subject);
    }
    // Disconnect from the server
    imapClient.Dispose();   
}

// Certificate verification handler
private static bool RemoteCertificateValidationHandler(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
{
    return true; // ignore the checks and go ahead
}

After connecting to an Exchange server using IMAP and getting the IMapMessageInfoCollection, you can get the MessageInfo object. The following code snippet shows you how to use the sequence number of the MessageInfo object to save a specific message.

// For complete examples and data files, please go to https://github.com/aspose-email/Aspose.Email-for-.NET
// Select the Inbox folder
imapClient.SelectFolder(ImapFolderInfo.InBox);
// Get the list of messages
ImapMessageInfoCollection msgCollection = imapClient.ListMessages();
foreach (ImapMessageInfo msgInfo in msgCollection)
{
    // Fetch the message from inbox using its SequenceNumber from msgInfo
    MailMessage message = imapClient.FetchMessage(msgInfo.SequenceNumber);

    // Save the message to disc now
    message.Save(dataDir + msgInfo.SequenceNumber + "_out.msg", SaveOptions.DefaultMsgUnicode);
}

Setting the preferred version of the encryption protocol

EWS uses HTTPS transport protocol for supported operations. Encryption is provided by SSL/TLS protocols. These protocols are implemented by the .NET framework and may be different in dependence on the current version of the .NET framework.

To set SSL/TLS version use the following code:

        var client = new ImapClient("some.host");
        client.SupportedEncryption = EncryptionProtocols.Tls13;

or

        var client = new ImapClient("some.host");
        client.SetSupportedEncryptionUnsafe(EncryptionProtocols.Tls13);

Note, if the specified EncryptionProtocol isn’t supported by the current version of the .NET framework, the SupportedEncryption property downgrades the encryption protocol to a supported level and the SetSupportedEncryptionUnsafe method throws an exception.