使用OpenPop.dll开发读取POP3邮件程序

1、设置邮件的pop3

以163网易邮箱为例：

https://jingyan.baidu.com/article/adc81513804be9f722bf7350.html

2、下载OpenPop.dll

官网下载地址：http://sourceforge.net/projects/hpop/

3、读取设置pop3邮箱的所有邮件内容：

 public class Pop3Helper
    {
        public static void ReadPop3()
        {
            using (Pop3Client client = new Pop3Client())
            {
                if (client.Connected)
                {
                    client.Disconnect();
                }

                // Connect to the server, false means don't use ssl
                client.Connect("pop3.163.com", 110, false);

                // Authenticate ourselves towards the server by email account and password
                client.Authenticate("xxx@163.com", "pop3授权码");

                //email count
                int messageCount = client.GetMessageCount();

                for (int i = 1; i <= messageCount; i++)
                {
                    Message message = client.GetMessage(i);

                    NameValueCollection customHeaders = message.Headers.UnknownHeaders;
                    string sender = message.Headers.From.DisplayName;
                    string from = message.Headers.From.Address;
                    string subject = message.Headers.Subject;
                    DateTime Datesent = message.Headers.DateSent;

                    MessagePart messagePart = message.MessagePart;

                    GetCustomInfo(customHeaders);

                    //email body
                    string body = " ";
                    if (messagePart.IsText)
                    {
                        body = messagePart.GetBodyAsText();
                    }
                    else if (messagePart.IsMultiPart)
                    {
                        MessagePart plainTextPart = message.FindFirstPlainTextVersion();
                        MessagePart htmlTextPart = message.FindFirstHtmlVersion();
                        if (htmlTextPart != null)
                        {

                            body = htmlTextPart.GetBodyAsText();
                        }

                        if (plainTextPart != null)
                        {
                            
                            body = plainTextPart.GetBodyAsText();
                        }
                        else
                        {
                            List<MessagePart> textVersions = message.FindAllTextVersions();
                            if (textVersions.Count >= 1)
                                body = textVersions[0].GetBodyAsText();
                            else
                                body = "<<OpenPop>> Cannot find a text version body in this message.";
                        }
                    }

                }

            }
        }

        //获取自定义字段内容
        private static void GetCustomInfo(NameValueCollection col)
        {
            if (col != null && col.Count > 0)
            {
                foreach (var cHeaderKey in col.AllKeys)
                {
                    switch (cHeaderKey)
                    {
                        case "X-CamId":
                            Console.WriteLine(string.Format("CamId：{0}", col[cHeaderKey]));
                            break;
                        case "X-SubId":
                            Console.WriteLine(string.Format("SubId：{0}", col[cHeaderKey]));
                            break;
                        case "X-UserId":
                            Console.WriteLine(string.Format("UserId：{0}",  col[cHeaderKey]));
                            break;
                        default:
                            break;
                    }
                    
                }

            }
        }
    }