用Socket发送电子邮件

using System;
using System.Web;
using System.Web.Mail;
using System.Text;
using System.Net;
using System.Net.Sockets;

namespace Email
...{
    /**//// <summary>
    /// Class1 的摘要说明。
    /// </summary>
    public class SendEmail
    ...{
        public string FromEmail="";
        public string ToEmail="";
        public string Title="";
        public string Content="";
        public string smtpserver="";

        public string errorstr=""; 
    
        public SendEmail()
        ...{    
                
        }
        public SendEmail(string _FromEmail,string _ToEmail,string _Title,string _Content, string _smtpserver)
        ...{
            FromEmail=_FromEmail;
            ToEmail=_ToEmail;
            Title=_Title;
            Content=_Content;
            smtpserver=_smtpserver;
        }
        public bool send()
        ...{
            
            bool flg;
            MailMessage Message=null;
            Message = new MailMessage();
            Message.BodyEncoding = Encoding.Default;
            Message.BodyFormat = MailFormat.Html;
            Message.Subject=Title;
            Message.From = FromEmail;            
            Message.To = ToEmail;
            Message.Body  =Content.ToString();
            try
            ...{            
                SmtpMail.SmtpServer = smtpserver;                
                SmtpMail.Send(Message);
                flg=true;
        
            }
            catch(Exception e)
            ...{
                errorstr=e.ToString();
                flg=false;
            }    
            return flg;
        } 


        public bool send2()  //发送电子邮件
        ...{
            bool flg;
            Socket s = null;
            IPAddress Ip;
            IPEndPoint hostEndPoint;            
            string sIp=smtpserver;
            int conPort = 25;
            string Cmd1="", Cmd2="", Cmd3="", Cmd4="", Cmd5="",  Cmd6="",  Cmd7="";
            
            Byte[] PostBytes = new Byte[128];
            Byte[] RecvBytes = new Byte[256];
            string strRetPage = null;

            s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            Ip = IPAddress.Parse(sIp); 
            hostEndPoint = new IPEndPoint(Ip,conPort);
            Cmd1="Helo ";
            Cmd2="mail from:"+ FromEmail +" ";            
            Cmd3="rcpt to:"+ToEmail +" ";
            Cmd4="data ";

            string KK;
            KK="MIME-Version: 1.0"+" ";
            KK+="Content-Type: multipart/alternative;"+" ";
            KK+="    boundary="----=_NextPart_000_000D_01C5B928.9630AD10""+" ";
            KK+="X-Mailer: Microsoft CDO for Windows 2000"+" ";
            KK+="Content-Class: urn:content-classes:message"+" ";
            KK+="X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1506"+" ";
            KK+=" ";
            KK+="------=_NextPart_000_000D_01C5B928.9630AD10"+" ";
            KK+="Content-Type: text/html;"+" ";
            KK+="    charset="gb2312""+" ";
            KK+=" ";
            KK+=Content+" ";    
            KK+=" ";
            KK+="------=_NextPart_000_000D_01C5B928.9630AD10--"+" ";
            
            KK=KK.Replace(" . ",".");

            string KK2;
            KK2="From: <"+FromEmail+">"+" ";
            KK2+="To: <"+ToEmail+">"+" ";
            Cmd5=KK2+"Subject:"+Title+" "+KK;
            
            Cmd6=" . ";
            Cmd7="quit ";
        
            
            s.Connect(hostEndPoint);
            if (!s.Connected)
            ...{                    
                flg=false;
            }
            Encoding ASCII = Encoding.ASCII;
            Encoding DEFAU = Encoding.Default;

            try
            ...{
                PostBytes =  ASCII.GetBytes(Cmd1);
                s.Send(PostBytes, PostBytes.Length, 0);    
                Int32 bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
                strRetPage = DEFAU.GetString(RecvBytes, 0, bytes);        


                PostBytes =  ASCII.GetBytes(Cmd2);
                s.Send(PostBytes, PostBytes.Length, 0);
                bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
                strRetPage = DEFAU.GetString(RecvBytes, 0, bytes);

                PostBytes =  ASCII.GetBytes(Cmd3);
                s.Send(PostBytes, PostBytes.Length, 0);
                bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
                strRetPage = DEFAU.GetString(RecvBytes, 0, bytes);

                PostBytes =  ASCII.GetBytes(Cmd4);
                s.Send(PostBytes, PostBytes.Length, 0);
                bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
                strRetPage = DEFAU.GetString(RecvBytes, 0, bytes);


                PostBytes = DEFAU.GetBytes(Cmd5);
                s.Send(PostBytes, PostBytes.Length, 0);                
            

                PostBytes =  ASCII.GetBytes(Cmd6);
                s.Send(PostBytes, PostBytes.Length, 0);
                bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
                strRetPage = DEFAU.GetString(RecvBytes, 0, bytes);

                PostBytes =  ASCII.GetBytes(Cmd7);
                s.Send(PostBytes, PostBytes.Length, 0);
                bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
                strRetPage = DEFAU.GetString(RecvBytes, 0, bytes);

                s.Close();
                flg=true;
            }
            catch(Exception e)
            ...{
                errorstr=e.ToString();
                flg=false;
            }

            return flg;
        }
    }
}

 

 

调用方法：

 

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace testMail
...{
    /**//// <summary>
    /// Form1 的摘要说明。
    /// </summary>
    public class Form1 : System.Windows.Forms.Form
    ...{
        private System.Windows.Forms.TextBox textBox1;
        private System.Windows.Forms.TextBox textBox2;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.TextBox textBox4;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.Label label4;
        private System.Windows.Forms.TextBox textBox5;
        private System.Windows.Forms.Label label5;
        private System.Windows.Forms.Label label6;
        private System.Windows.Forms.Button button2;
        private System.Windows.Forms.TextBox textBox3;
        private System.Windows.Forms.RadioButton radioButton1;
        private System.Windows.Forms.RadioButton radioButton2;
        /**//// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.Container components = null;

        public Form1()
        ...{
            //
            // Windows 窗体设计器支持所必需的
            //
            InitializeComponent();

            //
            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
            //
        }

        /**//// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        protected override void Dispose( bool disposing )
        ...{
            if( disposing )
            ...{
                if (components != null) 
                ...{
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        Windows 窗体设计器生成的代码#region Windows 窗体设计器生成的代码
        /**//// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        ...{
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.textBox2 = new System.Windows.Forms.TextBox();
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.textBox4 = new System.Windows.Forms.TextBox();
            this.label3 = new System.Windows.Forms.Label();
            this.label4 = new System.Windows.Forms.Label();
            this.textBox5 = new System.Windows.Forms.TextBox();
            this.label5 = new System.Windows.Forms.Label();
            this.label6 = new System.Windows.Forms.Label();
            this.button2 = new System.Windows.Forms.Button();
            this.textBox3 = new System.Windows.Forms.TextBox();
            this.radioButton1 = new System.Windows.Forms.RadioButton();
            this.radioButton2 = new System.Windows.Forms.RadioButton();
            this.SuspendLayout();
            // 
            // textBox1
            // 
            this.textBox1.Location = new System.Drawing.Point(72, 32);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(160, 21);
            this.textBox1.TabIndex = 0;
            this.textBox1.Text = "test@hx2004.com";
            // 
            // textBox2
            // 
            this.textBox2.Location = new System.Drawing.Point(72, 64);
            this.textBox2.Name = "textBox2";
            this.textBox2.Size = new System.Drawing.Size(104, 21);
            this.textBox2.TabIndex = 1;
            this.textBox2.Text = "218.97.193.82";
            // 
            // label1
            // 
            this.label1.Location = new System.Drawing.Point(16, 32);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(56, 16);
            this.label1.TabIndex = 4;
            this.label1.Text = "发件人：";
            // 
            // label2
            // 
            this.label2.Location = new System.Drawing.Point(256, 32);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(56, 16);
            this.label2.TabIndex = 6;
            this.label2.Text = "收件人：";
            // 
            // textBox4
            // 
            this.textBox4.Location = new System.Drawing.Point(320, 32);
            this.textBox4.Name = "textBox4";
            this.textBox4.Size = new System.Drawing.Size(160, 21);
            this.textBox4.TabIndex = 5;
            this.textBox4.Text = "hch@szdomain.com ";
            // 
            // label3
            // 
            this.label3.Location = new System.Drawing.Point(16, 56);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(56, 32);
            this.label3.TabIndex = 7;
            this.label3.Text = "发送邮件服务器：";
            // 
            // label4
            // 
            this.label4.Location = new System.Drawing.Point(192, 64);
            this.label4.Name = "label4";
            this.label4.Size = new System.Drawing.Size(40, 16);
            this.label4.TabIndex = 9;
            this.label4.Text = "标题：";
            // 
            // textBox5
            // 
            this.textBox5.Location = new System.Drawing.Point(248, 64);
            this.textBox5.Name = "textBox5";
            this.textBox5.Size = new System.Drawing.Size(160, 21);
            this.textBox5.TabIndex = 8;
            this.textBox5.Text = "华夏OnLine欢庆中秋";
            // 
            // label5
            // 
            this.label5.Location = new System.Drawing.Point(16, 96);
            this.label5.Name = "label5";
            this.label5.Size = new System.Drawing.Size(56, 16);
            this.label5.TabIndex = 10;
            this.label5.Text = "内容：";
            // 
            // label6
            // 
            this.label6.Location = new System.Drawing.Point(24, 336);
            this.label6.Name = "label6";
            this.label6.Size = new System.Drawing.Size(528, 24);
            this.label6.TabIndex = 11;
            // 
            // button2
            // 
            this.button2.Location = new System.Drawing.Point(432, 64);
            this.button2.Name = "button2";
            this.button2.Size = new System.Drawing.Size(88, 24);
            this.button2.TabIndex = 12;
            this.button2.Text = "发送邮件";
            this.button2.Click += new System.EventHandler(this.button2_Click);
            // 
            // textBox3
            // 
            this.textBox3.AcceptsReturn = true;
            this.textBox3.Location = new System.Drawing.Point(16, 120);
            this.textBox3.Multiline = true;
            this.textBox3.Name = "textBox3";
            this.textBox3.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
            this.textBox3.Size = new System.Drawing.Size(528, 208);
            this.textBox3.TabIndex = 13;
            this.textBox3.Text = @"<HTML>
    <HEAD>
        <title>华夏OnLine欢庆中秋</title>
        <meta http-equiv=""Content-Language"" content=""zh-cn"">
<meta http-equiv=""Content-Type"" content=""text/html; charset=gb2312"">        
    </HEAD>
    <body>
         海风 从《华夏 Online》 中文官方网站 (www.hx2004.com) 给您寄来了一张精美的贺卡和一份中秋的思念与祝福 ！ </span>
        
    </body>
</HTML>";
            // 
            // radioButton1
            // 
            this.radioButton1.Location = new System.Drawing.Point(72, 8);
            this.radioButton1.Name = "radioButton1";
            this.radioButton1.Size = new System.Drawing.Size(80, 16);
            this.radioButton1.TabIndex = 14;
            this.radioButton1.Text = "组件方式";
            // 
            // radioButton2
            // 
            this.radioButton2.Checked = true;
            this.radioButton2.Location = new System.Drawing.Point(168, 8);
            this.radioButton2.Name = "radioButton2";
            this.radioButton2.Size = new System.Drawing.Size(96, 16);
            this.radioButton2.TabIndex = 15;
            this.radioButton2.TabStop = true;
            this.radioButton2.Text = "Socket方式";
            // 
            // Form1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.ClientSize = new System.Drawing.Size(560, 365);
            this.Controls.Add(this.radioButton2);
            this.Controls.Add(this.radioButton1);
            this.Controls.Add(this.textBox3);
            this.Controls.Add(this.button2);
            this.Controls.Add(this.label6);
            this.Controls.Add(this.label5);
            this.Controls.Add(this.label4);
            this.Controls.Add(this.textBox5);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.textBox4);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.textBox2);
            this.Controls.Add(this.textBox1);
            this.Name = "Form1";
            this.Text = "发送电子邮件";
            this.ResumeLayout(false);

        }
        #endregion

        /**//// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main() 
        ...{
            Application.Run(new Form1());
        }

        private void button2_Click(object sender, System.EventArgs e)
        ...{
            Email.SendEmail a=new Email.SendEmail();
            a.FromEmail=textBox1.Text;
            a.ToEmail=textBox4.Text;
            a.smtpserver=textBox2.Text;
            a.Title=textBox5.Text;
            a.Content=textBox3.Text;
            bool k;
            string kkkk;
            if (radioButton1.Checked==true)
            ...{
                k=a.send();
                kkkk="组件方式";
                
            }
            else
            ...{
                kkkk="Socket方式";
                k=a.send2();
            }

            if (k)
            ...{
                label6.Text=kkkk+"发送邮件到"+textBox4.Text+"成功！";
            } 
            else
            ...{
                label6.Text="失败！，失败原因："+a.errorstr.ToString();
                
            }
        
        }
    }
}