C#/ASP.NET/ASP MVC - Retrieve email using Microsoft OAuth 2.0 + Graph API/EWS/IMAP/POP3 protocol from Office 365 in background service¶

using System;
using System.Text;
using System.IO;
using System.Net;
using System.Globalization;
using EAGetMail;

// Generate an unqiue email file name based on date time
static string _generateFileName(int sequence)
{
    DateTime currentDateTime = DateTime.Now;
    return string.Format("{0}-{1:000}-{2:000}.eml",
        currentDateTime.ToString("yyyyMMddHHmmss", new CultureInfo("en-US")),
        currentDateTime.Millisecond,
        sequence);
}

static string _postString(string uri, string requestData)
{
    HttpWebRequest httpRequest = WebRequest.Create(uri) as HttpWebRequest;
    httpRequest.Method = "POST";
    httpRequest.ContentType = "application/x-www-form-urlencoded";

    using (Stream requestStream = httpRequest.GetRequestStream())
    {
        byte[] requestBuffer = Encoding.UTF8.GetBytes(requestData);
        requestStream.Write(requestBuffer, 0, requestBuffer.Length);
        requestStream.Close();
    }

    try
    {
        HttpWebResponse httpResponse = httpRequest.GetResponse() as HttpWebResponse;
        using (StreamReader reader = new StreamReader(httpResponse.GetResponseStream()))
        {
            // reads response body
            string responseText = reader.ReadToEnd();
            Console.WriteLine(responseText);
            return responseText;
        }
    }
    catch (WebException ex)
    {
        if (ex.Status == WebExceptionStatus.ProtocolError)
        {
            var response = ex.Response as HttpWebResponse;
            if (response != null)
            {
                Console.WriteLine("HTTP: " + response.StatusCode);
                using (StreamReader reader = new StreamReader(response.GetResponseStream()))
                {
                    // reads response body
                    string responseText = reader.ReadToEnd();
                    Console.WriteLine(responseText);
                }
            }
        }

        throw;
    }
}

public static void RetrieveEmail()
{
    try
    {
        string client_id = "b22194da-44d6-4320-a067-e86a275d6fa4";
        string client_secret = "VTO8Q~eo0JCXc291jcM4wnhZ_GXyKMu.";

        // If your application is not created by Office365 administrator,
        // please use Office365 directory tenant id, you should ask Offic365 administrator to send it to you.
        // Office365 administrator can query tenant id in https://portal.azure.com/ - Azure Active Directory.
        string tenant = "2ea4955d-830e-4aa7-8ab5-661a6b9aa84d";

        string requestData =
            string.Format("client_id={0}&client_secret={1}&scope=https://graph.microsoft.com/.default&grant_type=client_credentials",
                client_id, client_secret);

        string tokenUri = string.Format("https://login.microsoftonline.com/{0}/oauth2/v2.0/token", tenant);
        string responseText = _postString(tokenUri, requestData);

        OAuthResponseParser parser = new OAuthResponseParser();
        parser.Load(responseText);

        string officeUser = "user@mydomain.onmicrosoft.com";
        // Create a folder named "inbox" under current directory
        // to save the email retrieved.
        string localInbox = string.Format("{0}\\inbox", Directory.GetCurrentDirectory());
        // If the folder is not existed, create it.
        if (!Directory.Exists(localInbox))
        {
            Directory.CreateDirectory(localInbox);
        }

        // Microsoft Graph API server address
        MailServer oServer = new MailServer("graph.microsoft.com",
                officeUser,
                parser.AccessToken, // use access token as password
                ServerProtocol.MsGraphApi); // use Http Graph API protocol

        // Set OAUTH 2.0
        oServer.AuthType = ServerAuthType.AuthXOAUTH2;
        // Enable SSL/TLS connection
        oServer.SSLConnection = true;

        MailClient oClient = new MailClient("TryIt");
        // Get new email only, if you want to get all emails, please remove this line
        oClient.GetMailInfosParam.GetMailInfosOptions = GetMailInfosOptionType.NewOnly;

        Console.WriteLine("Connecting {0} ...", oServer.Server);
        oClient.Connect(oServer);

        MailInfo[] infos = oClient.GetMailInfos();
        Console.WriteLine("Total {0} email(s)\r\n", infos.Length);

        for (int i = 0; i < infos.Length; i++)
        {
            MailInfo info = infos[i];
            Console.WriteLine("Index: {0}; Size: {1}; UIDL: {2}",
                info.Index, info.Size, info.UIDL);

            // Receive email from email server
            Mail oMail = oClient.GetMail(info);

            Console.WriteLine("From: {0}", oMail.From.ToString());
            Console.WriteLine("Subject: {0}\r\n", oMail.Subject);

            // Generate an unqiue email file name based on date time.
            string fileName = _generateFileName(i + 1);
            string fullPath = string.Format("{0}\\{1}", localInbox, fileName);

            // Save email to local disk
            oMail.SaveAs(fullPath, true);

            // Mark email as read to prevent retrieving this email again.
            oClient.MarkAsRead(info, true);

            // If you want to delete current email, please use Delete method instead of MarkAsRead
            // oClient.Delete(info);
        }

        // Quit and expunge emails marked as deleted from server.
        oClient.Quit();
        Console.WriteLine("Completed!");
    }
    catch (Exception ep)
    {
        Console.WriteLine(ep.ToString());
    }
}

using System;
using System.Text;
using System.IO;
using System.Net;
using System.Globalization;
using EAGetMail;

// Generate an unqiue email file name based on date time
static string _generateFileName(int sequence)
{
    DateTime currentDateTime = DateTime.Now;
    return string.Format("{0}-{1:000}-{2:000}.eml",
        currentDateTime.ToString("yyyyMMddHHmmss", new CultureInfo("en-US")),
        currentDateTime.Millisecond,
        sequence);
}

static string _postString(string uri, string requestData)
{
    HttpWebRequest httpRequest = WebRequest.Create(uri) as HttpWebRequest;
    httpRequest.Method = "POST";
    httpRequest.ContentType = "application/x-www-form-urlencoded";

    using (Stream requestStream = httpRequest.GetRequestStream())
    {
        byte[] requestBuffer = Encoding.UTF8.GetBytes(requestData);
        requestStream.Write(requestBuffer, 0, requestBuffer.Length);
        requestStream.Close();
    }

    try
    {
        HttpWebResponse httpResponse = httpRequest.GetResponse() as HttpWebResponse;
        using (StreamReader reader = new StreamReader(httpResponse.GetResponseStream()))
        {
            // reads response body
            string responseText = reader.ReadToEnd();
            Console.WriteLine(responseText);
            return responseText;
        }
    }
    catch (WebException ex)
    {
        if (ex.Status == WebExceptionStatus.ProtocolError)
        {
            var response = ex.Response as HttpWebResponse;
            if (response != null)
            {
                Console.WriteLine("HTTP: " + response.StatusCode);
                using (StreamReader reader = new StreamReader(response.GetResponseStream()))
                {
                    // reads response body
                    string responseText = reader.ReadToEnd();
                    Console.WriteLine(responseText);
                }
            }
        }

        throw;
    }
}

public static void RetrieveEmail()
{
    try
    {
        string client_id = "b22194da-44d6-4320-a067-e86a275d6fa4";
        string client_secret = "VTO8Q~eo0JCXc291jcM4wnhZ_GXyKMu.";

        // If your application is not created by Office365 administrator,
        // please use Office365 directory tenant id, you should ask Offic365 administrator to send it to you.
        // Office365 administrator can query tenant id in https://portal.azure.com/ - Azure Active Directory.
        string tenant = "2ea4955d-830e-4aa7-8ab5-661a6b9aa84d";

        string requestData =
            string.Format("client_id={0}&client_secret={1}&scope=https://outlook.office365.com/.default&grant_type=client_credentials",
                client_id, client_secret);

        string tokenUri = string.Format("https://login.microsoftonline.com/{0}/oauth2/v2.0/token", tenant);
        string responseText = _postString(tokenUri, requestData);

        OAuthResponseParser parser = new OAuthResponseParser();
        parser.Load(responseText);

        string officeUser = "user@mydomain.onmicrosoft.com";
        // Create a folder named "inbox" under current directory
        // to save the email retrieved.
        string localInbox = string.Format("{0}\\inbox", Directory.GetCurrentDirectory());
        // If the folder is not existed, create it.
        if (!Directory.Exists(localInbox))
        {
            Directory.CreateDirectory(localInbox);
        }

        // Office 365 server address
        MailServer oServer = new MailServer("outlook.office365.com",
                officeUser,
                parser.AccessToken, // use access token as password
                ServerProtocol.ExchangeEWS); // use Http EWS protocol

        // Set OAUTH 2.0
        oServer.AuthType = ServerAuthType.AuthXOAUTH2;
        // Enable SSL/TLS connection
        oServer.SSLConnection = true;

        MailClient oClient = new MailClient("TryIt");
        // Get new email only, if you want to get all emails, please remove this line
        oClient.GetMailInfosParam.GetMailInfosOptions = GetMailInfosOptionType.NewOnly;

        Console.WriteLine("Connecting {0} ...", oServer.Server);
        oClient.Connect(oServer);

        MailInfo[] infos = oClient.GetMailInfos();
        Console.WriteLine("Total {0} email(s)\r\n", infos.Length);

        for (int i = 0; i < infos.Length; i++)
        {
            MailInfo info = infos[i];
            Console.WriteLine("Index: {0}; Size: {1}; UIDL: {2}",
                info.Index, info.Size, info.UIDL);

            // Receive email from email server
            Mail oMail = oClient.GetMail(info);

            Console.WriteLine("From: {0}", oMail.From.ToString());
            Console.WriteLine("Subject: {0}\r\n", oMail.Subject);

            // Generate an unqiue email file name based on date time.
            string fileName = _generateFileName(i + 1);
            string fullPath = string.Format("{0}\\{1}", localInbox, fileName);

            // Save email to local disk
            oMail.SaveAs(fullPath, true);

            // Mark email as read to prevent retrieving this email again.
            oClient.MarkAsRead(info, true);

            // If you want to delete current email, please use Delete method instead of MarkAsRead
            // oClient.Delete(info);
        }

        // Quit and expunge emails marked as deleted from server.
        oClient.Quit();
        Console.WriteLine("Completed!");
    }
    catch (Exception ep)
    {
        Console.WriteLine(ep.ToString());
    }
}

using System;
using System.Text;
using System.IO;
using System.Net;
using System.Globalization;
using EAGetMail;

// Generate an unqiue email file name based on date time
static string _generateFileName(int sequence)
{
    DateTime currentDateTime = DateTime.Now;
    return string.Format("{0}-{1:000}-{2:000}.eml",
        currentDateTime.ToString("yyyyMMddHHmmss", new CultureInfo("en-US")),
        currentDateTime.Millisecond,
        sequence);
}

static string _postString(string uri, string requestData)
{
    HttpWebRequest httpRequest = WebRequest.Create(uri) as HttpWebRequest;
    httpRequest.Method = "POST";
    httpRequest.ContentType = "application/x-www-form-urlencoded";

    using (Stream requestStream = httpRequest.GetRequestStream())
    {
        byte[] requestBuffer = Encoding.UTF8.GetBytes(requestData);
        requestStream.Write(requestBuffer, 0, requestBuffer.Length);
        requestStream.Close();
    }

    try
    {
        HttpWebResponse httpResponse = httpRequest.GetResponse() as HttpWebResponse;
        using (StreamReader reader = new StreamReader(httpResponse.GetResponseStream()))
        {
            // reads response body
            string responseText = reader.ReadToEnd();
            Console.WriteLine(responseText);
            return responseText;
        }
    }
    catch (WebException ex)
    {
        if (ex.Status == WebExceptionStatus.ProtocolError)
        {
            var response = ex.Response as HttpWebResponse;
            if (response != null)
            {
                Console.WriteLine("HTTP: " + response.StatusCode);
                using (StreamReader reader = new StreamReader(response.GetResponseStream()))
                {
                    // reads response body
                    string responseText = reader.ReadToEnd();
                    Console.WriteLine(responseText);
                }
            }
        }

        throw;
    }
}

public static void RetrieveEmail()
{
    try
    {
        string client_id = "b22194da-44d6-4320-a067-e86a275d6fa4";
        string client_secret = "VTO8Q~eo0JCXc291jcM4wnhZ_GXyKMu.";

        // If your application is not created by Office365 administrator,
        // please use Office365 directory tenant id, you should ask Offic365 administrator to send it to you.
        // Office365 administrator can query tenant id in https://portal.azure.com/ - Azure Active Directory.
        string tenant = "2ea4955d-830e-4aa7-8ab5-661a6b9aa84d";

        string requestData =
            string.Format("client_id={0}&client_secret={1}&scope=https://outlook.office365.com/.default&grant_type=client_credentials",
                client_id, client_secret);

        string tokenUri = string.Format("https://login.microsoftonline.com/{0}/oauth2/v2.0/token", tenant);
        string responseText = _postString(tokenUri, requestData);

        OAuthResponseParser parser = new OAuthResponseParser();
        parser.Load(responseText);

        string officeUser = "grant-test@emailarchitect.net";
        // Create a folder named "inbox" under current directory
        // to save the email retrieved.
        string localInbox = string.Format("{0}\\inbox", Directory.GetCurrentDirectory());
        // If the folder is not existed, create it.
        if (!Directory.Exists(localInbox))
        {
            Directory.CreateDirectory(localInbox);
        }

        // Office 365 server address
        MailServer oServer = new MailServer("outlook.office365.com",
                officeUser,
                parser.AccessToken, // use access token as password
                ServerProtocol.Imap4); // use IMAP protocol

        // Set OAUTH 2.0
        oServer.AuthType = ServerAuthType.AuthXOAUTH2;
        // Enable SSL/TLS connection
        oServer.SSLConnection = true;
        // Set IMAP4 SSL Port
        oServer.Port = 993;

        MailClient oClient = new MailClient("TryIt");
        // Get new email only, if you want to get all emails, please remove this line
        oClient.GetMailInfosParam.GetMailInfosOptions = GetMailInfosOptionType.NewOnly;

        Console.WriteLine("Connecting {0} ...", oServer.Server);
        oClient.Connect(oServer);

        MailInfo[] infos = oClient.GetMailInfos();
        Console.WriteLine("Total {0} email(s)\r\n", infos.Length);

        for (int i = 0; i < infos.Length; i++)
        {
            MailInfo info = infos[i];
            Console.WriteLine("Index: {0}; Size: {1}; UIDL: {2}",
                info.Index, info.Size, info.UIDL);

            // Receive email from email server
            Mail oMail = oClient.GetMail(info);

            Console.WriteLine("From: {0}", oMail.From.ToString());
            Console.WriteLine("Subject: {0}\r\n", oMail.Subject);

            // Generate an unqiue email file name based on date time.
            string fileName = _generateFileName(i + 1);
            string fullPath = string.Format("{0}\\{1}", localInbox, fileName);

            // Save email to local disk
            oMail.SaveAs(fullPath, true);

            // Mark email as read to prevent retrieving this email again.
            oClient.MarkAsRead(info, true);

            // If you want to delete current email, please use Delete method instead of MarkAsRead
            // oClient.Delete(info);
        }

        // Quit and expunge emails marked as deleted from server.
        oClient.Quit();
        Console.WriteLine("Completed!");
    }
    catch (Exception ep)
    {
        Console.WriteLine(ep.ToString());
    }
}