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How to POP3 in C#
- Introduction
- Getting Started
- Connecting and Disconnecting
- Retrieving Messages
- Removing Messages
- Supporting Functions
- Using the Class
Connecting and Disconnecting
The first method of our Pop3 class is the Connect method. This method takes a server name, username and password parameter to connect to a remote (sometimes local) POP3 server.
public void Connect(string server, string username, string
password)
{
string message;
string response;
Connect(server, 110);
response = Response();
if (response.Substring(0, 3) != "+OK")
{
throw new Pop3Exception(response);
}
message = "USER " + username + "\r\n";
Write(message);
response = Response();
if (response.Substring(0, 3) != "+OK")
{
throw new Pop3Exception(response);
}
message = "PASS " + password + "\r\n";
Write(message);
response = Response();
if (response.Substring(0, 3) != "+OK")
{
throw new Pop3Exception(response);
}
}
We begin by calling the TcpClient.Connect method passing the
server name and the 110 port. The 110 port number is the well known port number
for POP3 operations. What that means is that POP3 servers by default should
listen for connections on port 110. When the POP3 server connects to a client,
it should immediately respond with the +OK acknowledgement message.
Next we send two messages, USER and PASS, back to
the server. The POP3 server should acknowledge a successful login by acknowledging
both messages. If the POP3 server returns anything but +OK, then
the message will contain the reason for the failure. In the advent of a failure,
I attach that failure message to our exception class and throw it back to the
client. It should be noted that some POP3 servers don't require authentication
and may reject the calls to USER and PASS. I haven't
encountered such a POP3 server, but the protocol allows it. In those cases,
you'll have to slightly modify the class to make things work.
Any use of our Pop3 class should begin with a call to Connect and
end with a class to Disconnect.
public void Disconnect()
{
string message;
string response;
message = "QUIT\r\n";
Write(message);
response = Response();
if (response.Substring(0, 3) != "+OK")
{
throw new Pop3Exception(response);
}
}
The Disconnect method sends a QUIT message to the
POP3 server.
Randy's article are Copyright 1998-2003 Randy Charles Morin
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hi all ,I have tried
but it does't work ,the message is : "-ERR Cannot connect to POP server 206.190.46.10 (206.190.46.10:110), connect error 10060\r\n"
anyone can help ??
thanks riry
//----------------------------------------------- private void button1_Click(object sender, EventArgs e) { try { Pop3 obj = new Pop3(); obj.Connect("pop3.yahoo.com", "myusername", "mypassword"); ArrayList list = obj.List(); foreach (Pop3Message msg in list) { Pop3Message msg2 = obj.Retrieve(msg); System.Console.WriteLine("Message {0}: {1}", msg2.number, msg2.message); } obj.Disconnect(); } catch (Pop3Exception ex) { MessageBox.Show(ex.Message); } catch (System.Exception ex) { MessageBox.Show(ex.Message); } }
When i change the port to 587 from 110 i got the following error
220 mx.google.com ESMTP g14sm11215098rvb.54
Hi Got the following error when i try to call
obj.Connect("smtp.gmail.com", txtUser.Text, txtPass.Text);
A Connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host failed to respond 209.85.199.111: 110
Can any body please help me to fix this error?
Your code is too good. But in your code what happen If i send email today it display that email & tomarrow it show empty inbox. if i again send email it display that new mail only. And i also want to fetch Email subject,Email Body then what i do. Please give solution