POP3 Client in C# and VB.NET
The Post Office Protocol (POP) was the first widely used protocol for receiving mail messages.
GemBox.Email enables you to work with the POP protocol in C# and VB.NET using a PopClient
class. It supports the latest version (version 3; POP3) defined in RFC 1939. To learn about how to receive an email and how to connect with some common POP3 servers (like Gmail, Outlook, Yahoo, etc.), visit our Receive example.
The following example shows how you can create a new PopClient
and use it to connect to, authenticate and disconnect from a remote POP3 server.

using System;
using GemBox.Email;
using GemBox.Email.Pop;
class Program
{
static void Main()
{
// If using the Professional version, put your serial key below.
ComponentInfo.SetLicense("FREE-LIMITED-KEY");
// Create new POP client.
using (var pop = new PopClient("<ADDRESS> (e.g. pop.gmail.com)"))
{
// By default the connect timeout is 5 sec.
pop.ConnectTimeout = TimeSpan.FromSeconds(4);
// Connect to POP server.
pop.Connect();
Console.WriteLine("Connected.");
// Authenticate using the credentials; username and password.
pop.Authenticate("<USERNAME>", "<PASSWORD>");
Console.WriteLine("Authenticated.");
}
Console.WriteLine("Disconnected.");
}
}
Imports System
Imports GemBox.Email
Imports GemBox.Email.Pop
Module Program
Sub Main()
' If using the Professional version, put your serial key below.
ComponentInfo.SetLicense("FREE-LIMITED-KEY")
' Create new POP client.
Using pop As New PopClient("<ADDRESS> (e.g. pop.gmail.com)")
' By default the connect timeout is 5 sec.
pop.ConnectTimeout = TimeSpan.FromSeconds(4)
' Connect to POP server.
pop.Connect()
Console.WriteLine("Connected.")
' Authenticate using the credentials; username and password.
pop.Authenticate("<USERNAME>", "<PASSWORD>")
Console.WriteLine("Authenticated.")
End Using
Console.WriteLine("Disconnected.")
End Sub
End Module
Even though POP protocol has largely been made obsolete by newer IMAP protocol, it's still widely used for simple email operations.
You can reuse the same connection that's established by the PopClient
object and your email server multiple times.
When calling the PopClient.Authenticate
method, the strongest possible password-based authentication mechanism will be used from the PopClient.SupportedAuthentications
collection.
To disconnect from the email server, you can use either the PopClient.Disconnect
or PopClient.Dispose
method.
Last, PopClient
utilizes the following protocol's extensions: