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本文涉及的内容：
1：自己制作Pop3Helper
信件格式的处理有麻烦
2：使用现成的pop3类
LumiSoft.Net.POP3.Client;
有两种处理方法
3：使用IMAP收邮件
功能似乎更多，比起pop3来。
4：SMTP发送邮件
关于 Mailbox unavailable. The server response was: 5.7.1 Unable to relay for xx 的错误处理
自己写一个POP3的接收程序并不是很简单。主要问题就是如何处理信件的格式。
其处理方法不是太复杂，用一个tcp联接就可以了。
这是代码
public class Pop3Helper
{
string _pop3server;
string _user;
int _port;
string _pwd;
public TcpClient _server;
public NetworkStream _netStream;
public StreamReader _reader;
public string _data;
public byte[] _charData;
public string _CRLF = "\r\n";
private string _log;
public string LogMSG
{
get { return _log; }
}
/// <summary>
///
/// </summary>
/// <param name="server"></param>
/// <param name="port"></param>
/// <param name="user"></param>
/// <param name="pwd"></param>
public Pop3Helper(string server, int port, string user, string pwd)
{
_pop3server = server;
_port = port;
_user = user;
_pwd = pwd;
}
/// <summary>
/// connect
/// </summary>
public void Connect()
{
//create a tcp connection
_server = new TcpClient(_pop3server, _port);
//prepare
_netStream = _server.GetStream();
_reader = new StreamReader(_server.GetStream());
if (!CheckResult(_reader.ReadLine()))
throw new Exception("Connect Error");
//login
_data = "USER " + this._user + _CRLF;
_charData = System.Text.Encoding.ASCII.GetBytes(_data.ToCharArray());
_netStream.Write(_charData, 0, _charData.Length);
if (!CheckResult(_reader.ReadLine()))
throw new Exception("User Error");
_data = "PASS " + this._pwd + _CRLF;
_charData = System.Text.Encoding.ASCII.GetBytes(_data.ToCharArray());
_netStream.Write(_charData, 0, _charData.Length);
if (!CheckResult(_reader.ReadLine()))
throw new Exception("Pass Error");
}
/// <summary>
/// get message Numbers
/// </summary>
/// <returns></returns>
public int GetMailCount()
{
try
{
_data = "STAT" + _CRLF;
_charData = System.Text.Encoding.ASCII.GetBytes(_data.ToCharArray());
_netStream.Write(_charData, 0, _charData.Length);
string resp = _reader.ReadLine();
string[] tokens = resp.Split(new char[] { ' ' });
return Convert.ToInt32(tokens[1]);
}
catch (Exception ex)
{
return 0;
}
}
public string GetMail(int id)
{
string line;
string content = "";
try
{
//get by id
_data = "RETR " + id + _CRLF;
_charData = System.Text.Encoding.ASCII.GetBytes(_data.ToCharArray());
_netStream.Write(_charData, 0, _charData.Length);
line = _reader.ReadLine();
if (line[0] != '-')
{
//end with '.'
while (line != ".")
{
line = _reader.ReadLine();
content += line + "\r\n";
}
}
return content;
}
catch (Exception err)
{
Log(err.Message);
return "Error";
}
}
public void DeleteMail(int id)
{
_data = "DELE" + id + _CRLF;
_charData = System.Text.Encoding.ASCII.GetBytes(_data.ToCharArray());
_netStream.Write(_charData, 0, _charData.Length);
if (!CheckResult(_reader.ReadLine()))
throw new Exception("Delete Error");
}
/// <summary>
/// close connection
/// </summary>
public void Close()
{
_data = "QUIT" + _CRLF;
_charData = System.Text.Encoding.ASCII.GetBytes(_data.ToCharArray());
_netStream.Write(_charData, 0, _charData.Length);
//close
_netStream.Close();
_reader.Close();
}
private bool CheckResult(string reply)
{
Log(reply);
if (reply.IndexOf("+OK") > -1)
return true;
else
return false;
}
private void Log(string msg)
{
_log += msg + "\r\n";
}
}
。。。。。
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