Retrieve Email over SSL connection in C++/CLI/CLR

In previous section, I introduced how to retrieve email from Exchange Server with WebDAV protocol. In this section, I will introduce how to retrieve email over SSL connection in C++/CLI/CLR.

Introduction

SSL and TLS

SSL connection encrypts data between the email component and POP3 server or IMAP4 server to protect user, password and email content in TCP/IP level. Now this technology is commonly used and many email servers are deployed with SSL such as Gmail, Yahoo and Hotmail.

There are two ways to deploy SSL on email server:

  • Implicit SSL

    Deploying SSL on another port (POP3: 995 port or IMAP4: 993 port) directly. This is most common way.

  • Explicit SSL (TLS)

    Using STARTTLS or STLS command to switch SSL channel on normal port (POP3: 110 port or IMAP4: 143 port);

EAGetMail POP3 component supports both ways. Please see the following example codes:

For Exchange Web Service/WebDAV protocol, the SSL is based on HTTPS connection, so you just need to set SSLConnection property and simply ignore Port property. Notice: Exchange Web Service requires SSL connection by default.

[C++/CLI/CLR Example - SSL/TLS]

// Retrieve email by normal TCP/IP without SSL connection
// POP3
MailServer ^oServer  = gcnew MailServer("myserveraddress",
    "myuser", "mypassword", ServerProtocol::Pop3);

// IMAP4
MailServer ^oServer  = gcnew MailServer("myserveraddress",
    "myuser", "mypassword", ServerProtocol::Imap4);

// Retrieve email over SSL connection with direct SSL.
// POP3 SSL
MailServer ^oServer  = gcnew MailServer("myserveraddress",
    "myuser", "mypassword", ServerProtocol::Pop3);
oServer->SSLConnection = true;
oServer->Port = 995;

// IMAP4 SSL
MailServer ^oServer  = gcnew MailServer("myserveraddress",
    "myuser", "mypassword", ServerProtocol::Imap4);
oServer->SSLConnection = true;
oServer->Port = 993;

// Retrieve email by SSL connection with STARTTLS or TLS command switching
// POP3 TLS
MailServer ^oServer  = gcnew MailServer("myserveraddress",
    "myuser", "mypassword", ServerProtocol::Pop3);
oServer->SSLConnection = true;
oServer->Port = 110;
oServer->SSLType = SSLConnectType::ConnectTLS;

// IMAP4 STARTTLS
MailServer ^oServer  = gcnew MailServer("myserveraddress",
    "myuser", "mypassword", ServerProtocol::Imap4);
oServer->SSLConnection = true;
oServer->Port = 143;
oServer->SSLType = SSLConnectType::ConnectTLS;

// Exchange WebDAV
MailServer ^oServer  = gcnew MailServer("myserveraddress",
    "myuser", "mypassword", false,
    ServerAuthType.AuthLogin, ServerProtocol::ExchangeWebDAV);

// Exchange Web Service SSL
MailServer ^oServer  = gcnew MailServer("myserveraddress",
    "myuser", "mypassword", true,
    ServerAuthType.AuthLogin, ServerProtocol::ExchangeEWS);

// Exchange WebDAV SSL
MailServer ^oServer  = gcnew MailServer("myserveraddress",
    "myuser", "mypassword", true,
    ServerAuthType.AuthLogin, ServerProtocol::ExchangeWebDAV);

Note

Remarks: All of examples in this section are based on first section: A simple C++/CLI/CLR project. To compile and run the following example codes successfully, please click here to learn how to create the test project and add reference to your project.

[C++/CLI/CLR Example - Retrieve email from POP3 server over SSL on 995 port]

The following example codes demonstrate how to retrieve emails from POP3 server over SSL connection on 995 port. In order to run it correctly, please change email server, user, password, folder, file name values.

Note

To get the full sample projects, please refer to Samples section.

#include "stdafx.h"

using namespace System;
using namespace System::IO;
using namespace EAGetMail; //add EAGetMail namespace

int main(array<System::String ^> ^args)
{
    // Create a folder named "inbox" under current directory
    // to save the email retrieved.
    String ^curpath = Directory::GetCurrentDirectory();
    String ^mailbox = String::Format("{0}\\inbox", curpath);

    // If the folder is not existed, create it.
    if (!Directory::Exists(mailbox))
    {
        Directory::CreateDirectory(mailbox);
    }

    MailServer ^oServer = gcnew MailServer("pop3.emailarchitect.net",
        "test@emailarchitect.net", "testpassword", ServerProtocol::Pop3 );
    MailClient ^oClient = gcnew MailClient("TryIt");

    // Enable SSL connection
    oServer->SSLConnection = true;

    // Set 995 SSL POP3 port
    oServer->Port = 995;

    try
    {
        oClient->Connect(oServer);
        array<MailInfo^> ^infos = oClient->GetMailInfos();
        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 POP3 server
            Mail ^oMail = oClient->GetMail(info);

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

            // Generate an email file name based on date time.
            System::DateTime d = System::DateTime::Now;
            System::Globalization::CultureInfo ^cur = gcnew
                System::Globalization::CultureInfo("en-US");
            String ^sdate = d.ToString("yyyyMMddHHmmss", cur);
            String ^fileName = String::Format("{0}\\{1}{2}{3}.eml",
                mailbox, sdate, d.Millisecond.ToString("d3"), i);

            // Save email to local disk
            oMail->SaveAs(fileName, true);

            // Mark email as deleted from POP3 server.
            oClient->Delete(info);
        }

        // Quit and purge emails marked as deleted from POP3 server.
        oClient->Quit();
    }
    catch (Exception ^ep)
    {
        Console::WriteLine(ep->Message);
    }

    return 0;
}

[C++/CLI/CLR Example - Retrieve email from IMAP4 server over SSL on 993 port]

The following example codes demonstrate how to retrieve emails from IMAP4 server over SSL connection on 993 port. In order to run it correctly, please change email server, user, password, folder, file name values.

Note

To get the full sample projects, please refer to Samples section.

#include "stdafx.h"

using namespace System;
using namespace System::IO;
using namespace EAGetMail; //add EAGetMail namespace

int main(array<System::String ^> ^args)
{
    // Create a folder named "inbox" under current directory
    // to save the email retrieved.
    String ^curpath = Directory::GetCurrentDirectory();
    String ^mailbox = String::Format("{0}\\inbox", curpath);

    // If the folder is not existed, create it.
    if (!Directory::Exists(mailbox))
    {
        Directory::CreateDirectory(mailbox);
    }

    MailServer ^oServer = gcnew MailServer("imap.emailarchitect.net",
        "test@emailarchitect.net", "testpassword", ServerProtocol::Imap4 );
    MailClient ^oClient = gcnew MailClient("TryIt");

    // Enable SSL connection
    oServer->SSLConnection = true;

    // Set 993 SSL IMAP4 port
    oServer->Port = 993;

    try
    {
        oClient->Connect(oServer);
        array<MailInfo^> ^infos = oClient->GetMailInfos();
        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 IMAP4 server
            Mail ^oMail = oClient->GetMail(info);

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

            // Generate an email file name based on date time.
            System::DateTime d = System::DateTime::Now;
            System::Globalization::CultureInfo ^cur = gcnew
                System::Globalization::CultureInfo("en-US");
            String ^sdate = d.ToString("yyyyMMddHHmmss", cur);
            String ^fileName = String::Format("{0}\\{1}{2}{3}.eml",
                mailbox, sdate, d.Millisecond.ToString("d3"), i);

            // Save email to local disk
            oMail->SaveAs(fileName, true);

            // Mark email as deleted from IMAP4 server.
            oClient->Delete(info);
        }

        // Quit and purge emails marked as deleted from IMAP4 server.
        oClient->Quit();
    }
    catch (Exception ^ep)
    {
        Console::WriteLine(ep->Message);
    }

    return 0;
}

Next Section

At next section I will introduce how to download emails from Gmail account.

Appendix

Comments

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