Gets or sets the protocol (POP3/IMAP4/Exchange Web Service/WebDAV) for mail server.
[Visual Basic] Public Property Protocol As ServerProtocol
[C#]
public ServerProtocol Protocol {get; set;}
[C++] public: __property ServerProtocol get_Protocol(); public: __property void set_Protocol(ServerProtocol);
[JScript] public function get Protocol() : ServerProtocol; public function set Protocol(ServerProtocol);
Property Value
Remarks
Standard POP3/IMAP4 protocol based on TCP/IP, all email servers support this protocol, Exchange Server also supports POP3/IMAP4 protocol. Using IMAP4 protocol is strongly recommended.
Exchange WebDAV is a set of methods based on the HTTP protocol to manage users, messages in Microsoft Exchange Server. We can use HTTP or HTTP/HTTPS protocol to retrieve email with Exchange WebDAV instead of POP3/IMAP4 protocol. But since Exchange 2007, WebDAV service is disabled by default, so we only suggest that you use WebDAV protocol in Exchange 2000/2003.
Exchange Web Services (EWS), an alternative to the MAPI protocol, is a documented SOAP based protocol introduced with Exchange Server 2007. We can use HTTP or HTTPS protocol to retrieve email with Exchange Web Services (EWS) instead of POP3/IMAP4 protocol. Since Exchange 2007 or later version, POP3/IMAP4 service are disabled by default, so we strongly suggest that you use EWS protocol in Exchange 2007/2010/2013 or later version.
Microsoft Graph API, an alternative to the EWS protocol, only Office 365 supports this protocol.
Gmail Rest API uses HTTPS protocol to access all emails or labels in Gmail email account.
Example
[Visual Basic, C#, C++] The following example demonstrates how to receive email with EAGetMail POP3 & IMAP Component, but it doesn't demonstrates the events and mail parsing usage. To get the full samples of EAGetMail, please refer to Samples section.
[VB - Retrieve Email from Server]
Imports System
Imports System.Globalization
Imports System.IO
Imports System.Text
Imports EAGetMail
Public Class TestClass
' Generate an unqiue email file name based on date time.
Shared Function _generateFileName(ByVal sequence As Integer) As String
Dim currentDateTime As DateTime = DateTime.Now
Return String.Format("{0}-{1:000}-{2:000}.eml",
currentDateTime.ToString("yyyyMMddHHmmss", New CultureInfo("en-US")),
currentDateTime.Millisecond,
sequence)
End Function
Public Sub ReceiveMail(server As String, user As String, password As String, useSsl As Boolean)
Try
' Create a folder named "inbox" under current directory
' to save the email retrieved.
Dim localInbox As String = String.Format("{0}\inbox", Directory.GetCurrentDirectory())
' If the folder is not existed, create it.
If Not Directory.Exists(localInbox) Then
Directory.CreateDirectory(localInbox)
End If
' To receive email from IMAP4 server, please change
' ServerProtocol.Pop3 to ServerProtocol.Imap4 in MailServer constructor
' To receive email with Exchange Web Service, please change
' ServerProtocol.Pop3 to ServerProtocol.ExchangeEWS to MailServer constructor
' To receive email with Exchange WebDAV, please change
' ServerProtocol.Pop3 to ServerProtocol.ExchangeWebDAV to MailServer constructor
' Exchange Server supports POP3/IMAP4 protocol as well, but in Exchange 2007
' Or later version, POP3/IMAP4 service Is disabled by default. If you don't want to use POP3/IMAP4
' to download email from Exchange Server, you can use Exchange Web Service (Exchange 2007-2019 Or
' later version) Or WebDAV (Exchange 2000/2003) protocol.
' Most modern email server require SSL/TLS connection,
' set useSsl to true Is recommended.
Dim oServer As New MailServer(server, user, password, useSsl,
ServerAuthType.AuthLogin, ServerProtocol.Pop3)
' POP3 port Is 110, POP3 SSL port Is 995
' IMAP4 port Is 143, IMAP4 SSL port Is 993.
' EWS/WebDAV, please ignore Port property.
If oServer.Protocol = ServerProtocol.Pop3 Then
oServer.Port = If(useSsl, 995, 110)
ElseIf oServer.Protocol = ServerProtocol.Imap4 Then
oServer.Port = If(useSsl, 993, 143)
End If
Console.WriteLine("Connecting server ...")
Dim oClient As New MailClient("TryIt")
oClient.Connect(oServer)
Console.WriteLine("Retrieving email list ...")
Dim infos() As MailInfo = oClient.GetMailInfos()
Console.WriteLine("Total {0} email(s)", infos.Length)
For i As Integer = 0 To infos.Length - 1
Console.WriteLine("Checking {0}/{1} ...", i + 1, infos.Length)
Dim info As MailInfo = infos(i)
' Generate an unqiue email file name based on date time.
Dim fileName As String = _generateFileName(i + 1)
Dim fullPath As String = String.Format("{0}\{1}", localInbox, fileName)
Console.WriteLine("Downloading {0}/{1} ...", i + 1, infos.Length)
Dim oMail As Mail = oClient.GetMail(info)
' Save email to local disk
oMail.SaveAs(fullPath, True)
' Mark email as deleted on server.
Console.WriteLine("Deleting ... {0}/{1}", i + 1, infos.Length)
oClient.Delete(info)
Next
Console.WriteLine("Disconnecting ...")
' Delete method just mark the email as deleted,
' Quit method expunge the emails from server permanently.
oClient.Quit()
Console.WriteLine("Completed!")
Catch ep As Exception
Console.WriteLine("Error: {0}", ep.Message)
End Try
End Sub
End Class
[C# - Retrieve Email from Server]
using System;
using System.IO;
using System.Globalization;
using System.Text;
using EAGetMail;
class TestClass
{
// 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);
}
public void ReceiveMail(string server, string user, string password, bool useSsl)
{
try
{
// 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);
}
// To receive email from IMAP4 server, please change
// ServerProtocol.Pop3 to ServerProtocol.Imap4 in MailServer constructor
// To receive email with Exchange Web Service, please change
// ServerProtocol.Pop3 to ServerProtocol.ExchangeEWS to MailServer constructor
// To receive email with Exchange WebDAV, please change
// ServerProtocol.Pop3 to ServerProtocol.ExchangeWebDAV to MailServer constructor
// Exchange Server supports POP3/IMAP4 protocol as well, but in Exchange 2007
// or later version, POP3/IMAP4 service is disabled by default. If you don't want to use POP3/IMAP4
// to download email from Exchange Server, you can use Exchange Web Service (Exchange 2007-2019 or
// later version) or WebDAV (Exchange 2000/2003) protocol.
// Most modern email server require SSL/TLS connection,
// set useSsl to true is recommended.
MailServer oServer = new MailServer(server, user, password, useSsl,
ServerAuthType.AuthLogin, ServerProtocol.Pop3);
// POP3 port is 110, POP3 SSL port is 995
// IMAP4 port is 143, IMAP4 SSL port is 993.
// EWS/WebDAV, please ignore Port property.
if (oServer.Protocol == ServerProtocol.Pop3)
{
oServer.Port = (useSsl) ? 995 : 110;
}
else if (oServer.Protocol == ServerProtocol.Imap4)
{
oServer.Port = (useSsl) ? 993 : 143;
}
Console.WriteLine("Connecting server ...");
MailClient oClient = new MailClient("TryIt");
oClient.Connect(oServer);
Console.WriteLine("Retreiving email list ...");
MailInfo[] infos = oClient.GetMailInfos();
Console.WriteLine("Total {0} email(s)", infos.Length);
for (int i = 0; i < infos.Length; i++)
{
Console.WriteLine("Checking {0}/{1} ...", i+1, infos.Length);
MailInfo info = infos[i];
// Generate an unqiue email file name based on date time.
string fileName = _generateFileName(i + 1);
string fullPath = string.Format("{0}\\{1}", localInbox, fileName);
Console.WriteLine("Downloading {0}/{1} ...", i + 1, infos.Length);
Mail oMail = oClient.GetMail(info);
// Save mail to local file
oMail.SaveAs(fullPath, true);
// Mark the email as deleted on server.
Console.WriteLine("Deleting ... {0}/{1}", i + 1, infos.Length);
oClient.Delete(info);
}
Console.WriteLine("Disconnecting ...");
// Delete method just mark the email as deleted,
// Quit method expunge the emails from server permanently.
oClient.Quit();
Console.WriteLine("Completed!");
}
catch (Exception ep)
{
Console.WriteLine("Error: {0}", ep.Message);
}
}
}
[C++/CLI - Retrieve Email from Server]
using namespace System;
using namespace System::Globalization;
using namespace System::IO;
using namespace EAGetMail; //add EAGetMail namespace
// 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", gcnew CultureInfo("en-US")),
currentDateTime.Millisecond,
sequence);
}
void ReceiveMail(String ^server, String ^user, String ^password, bool useSsl)
{
try
{
// 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);
}
// To receive email from IMAP4 server, please change
// ServerProtocol.Pop3 to ServerProtocol.Imap4 in MailServer constructor
// To receive email with Exchange Web Service, please change
// ServerProtocol.Pop3 to ServerProtocol.ExchangeEWS to MailServer constructor
// To receive email with Exchange WebDAV, please change
// ServerProtocol.Pop3 to ServerProtocol.ExchangeWebDAV to MailServer constructor
// Exchange Server supports POP3/IMAP4 protocol as well, but in Exchange 2007
// or later version, POP3/IMAP4 service is disabled by default. If you don't want to use POP3/IMAP4
// to download email from Exchange Server, you can use Exchange Web Service (Exchange 2007-2019 or
// later version) or WebDAV (Exchange 2000/2003) protocol.
// Most modern email server require SSL/TLS connection,
// set useSsl to true is recommended.
MailServer ^oServer = gcnew MailServer(server, user, password, useSsl,
ServerAuthType::AuthLogin, ServerProtocol::Pop3);
// POP3 port is 110, POP3 SSL port is 995
// IMAP4 port is 143, IMAP4 SSL port is 993.
// EWS/WebDAV, please ignore Port property.
if (oServer->Protocol == ServerProtocol::Pop3)
{
oServer->Port = (useSsl) ? 995 : 110;
}
else if (oServer->Protocol == ServerProtocol::Imap4)
{
oServer->Port = (useSsl) ? 993 : 143;
}
Console::WriteLine("Connecting server ...");
MailClient ^oClient = gcnew MailClient("TryIt");
oClient->Connect(oServer);
Console::WriteLine("Retreiving email list ...");
array<MailInfo^>^infos = oClient->GetMailInfos();
Console::WriteLine("Total {0} email(s)", infos->Length);
for (int i = 0; i < infos->Length; i++)
{
Console::WriteLine("Checking {0}/{1}", i + 1, infos->Length);
MailInfo ^info = infos[i];
// Generate an unqiue email file name based on date time
String^ fileName = _generateFileName(i + 1);
String^ fullPath = String::Format("{0}\\{1}", localInbox, fileName);
Console::WriteLine("Downloading {0}/{1}", i + 1, infos->Length);
Mail ^oMail = oClient->GetMail(info);
// Save email to local disk
oMail->SaveAs(fullPath, true);
// Mark email as deleted on server.
Console::WriteLine("Deleting ... {0}/{1}", i + 1, infos->Length);
oClient->Delete(info);
}
Console::WriteLine("Disconnecting ...");
// Delete method just mark the email as deleted,
// Quit method expunge the emails from server permanently.
oClient->Quit();
Console::WriteLine("Completed!");
}
catch (Exception ^ep)
{
Console::WriteLine("Error: {0}", ep->Message);
}
}
See Also
User Authentication and SSL/TLS Connection
MailClient.Connect Method
Online Tutorials
Read Email and Parse Email in C# - Tutorial
Read Email and Parse Email in VB.NET - Tutorial
Read Email and Parse Email C++/CLI - Tutorial