一个发送邮件的小例子

 

 public partial class SendMail : Form
    {
        string text = string.Empty;
        public SendMail()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string fromAddress=Txt_From.Text.Trim();
            string username = fromAddress.Substring(0,fromAddress.IndexOf("@"));
            string mailServer = "smtp." + fromAddress.Substring(fromAddress.IndexOf("@") + 1);
            string fromcheck = CheckMailAddress(Txt_From.Text.Trim());
           if(!string.IsNullOrEmpty(fromcheck))
           {
             Txt_From.Focus();
             MessageBox.Show("邮箱"+fromcheck+"存在问题！");
             return ;
           }
           string toAddress=Txt_To.Text.Trim();
           string toCheck=CheckMailAddress(toAddress);
           if(!string.IsNullOrEmpty(toCheck))
           {
             Txt_To.Focus();
             MessageBox.Show("邮箱"+fromcheck+"存在问题！");
             return;
           }
           //lijinchang3@163.com;lijc@finchina.com
           //webBrowser1.DocumentText = "测试邮件发送！";
           MailAddress from = new MailAddress(fromAddress);
           MailAddress to = new MailAddress(toAddress);
           MailMessage mailobj = new MailMessage(from, to);
           mailobj.Subject = Txt_Subject.Text.Trim();
           mailobj.Body = webBrowser1.DocumentText;//发送的信息
           mailobj.IsBodyHtml = true;
           mailobj.BodyEncoding = System.Text.Encoding.GetEncoding("GB2312");
           //邮件优先级
           mailobj.Priority = MailPriority.High;
           string []cc = Txt_CC.Text.Trim().Split(new string[] { ";" }, StringSplitOptions.RemoveEmptyEntries);
           foreach (string c in cc)
           {
               mailobj.CC.Add(c);
           }
           //Initializes a new instance of the System.Net.Mail.SmtpClient class
           //that sends e-mail by using the specified SMTP server.
           SmtpClient smtp = new SmtpClient(mailServer);
           //或者用：
           //SmtpClient smtp = new SmtpClient();
           //smtp.Host = mailServer;

           //不使用默认凭据访问服务器
           smtp.UseDefaultCredentials = false;
           string userPswd = "2323132";
           smtp.Credentials = new NetworkCredential(username, userPswd);
           //使用network发送到smtp服务器
           smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
           try
           {
               //开始发送邮件
               smtp.Send(mailobj);
               webBrowser1.DocumentText = "测试邮件已发送！";
               Thread.Sleep(100);
               webBrowser1.DocumentText = text;
           }
           catch (Exception ex)
           {
               Console.WriteLine(ex.Message);
               Console.WriteLine(ex.StackTrace);
           }

        }
        private string  CheckMailAddress(string adress)
        {
            string [] adds=adress.Split(new string[]{";"},StringSplitOptions.RemoveEmptyEntries);
            foreach (string ad in adds)
            {
                if (!new Regex(@"(?:[a-z\d]+[_\-\+\.]?)*[a-z\d]+@(?:([a-z\d]+\-?)*[a-z\d]+\.)+([a-z]{2,})+", RegexOptions.IgnoreCase).IsMatch(ad))
                {
                    return ad;
                }

            }
            return string.Empty;
        }

        private void SendMail_Load(object sender, EventArgs e)
        {

        }

        private void button2_Click(object sender, EventArgs e)
        {
            OpenFileDialog opendialog = new OpenFileDialog();
            opendialog.Filter = "html(*.htm;*.html)|*.html;*.htm";
            opendialog.Title = "选择发送文件";
            if (DialogResult.OK == opendialog.ShowDialog())
            {
                text = File.ReadAllText(opendialog.FileName, Encoding.Default);
                webBrowser1.DocumentText = text;
            }
        }
    }

 

定义界面

 

partial class SendMail
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.Txt_From = new System.Windows.Forms.TextBox();
            this.Txt_To = new System.Windows.Forms.TextBox();
            this.lb1 = new System.Windows.Forms.Label();
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.Txt_Subject = new System.Windows.Forms.TextBox();
            this.label3 = new System.Windows.Forms.Label();
            this.webBrowser1 = new System.Windows.Forms.WebBrowser();
            this.button1 = new System.Windows.Forms.Button();
            this.Txt_CC = new System.Windows.Forms.TextBox();
            this.label4 = new System.Windows.Forms.Label();
            this.button2 = new System.Windows.Forms.Button();
            this.SuspendLayout();
            //
            // Txt_From
            //
            this.Txt_From.Location = new System.Drawing.Point(118, 24);
            this.Txt_From.Name = "Txt_From";
            this.Txt_From.Size = new System.Drawing.Size(305, 21);
            this.Txt_From.TabIndex = 0;
            //
            // Txt_To
            //
            this.Txt_To.Location = new System.Drawing.Point(118, 52);
            this.Txt_To.Name = "Txt_To";
            this.Txt_To.Size = new System.Drawing.Size(305, 21);
            this.Txt_To.TabIndex = 1;
            //
            // lb1
            //
            this.lb1.AutoSize = true;
            this.lb1.Location = new System.Drawing.Point(60, 27);
            this.lb1.Name = "lb1";
            this.lb1.Size = new System.Drawing.Size(41, 12);
            this.lb1.TabIndex = 2;
            this.lb1.Text = "发送人";
            //
            // label1
            //
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(60, 55);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(41, 12);
            this.label1.TabIndex = 3;
            this.label1.Text = "接受人";
            //
            // label2
            //
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(62, 109);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(29, 12);
            this.label2.TabIndex = 4;
            this.label2.Text = "标题";
            //
            // Txt_Subject
            //
            this.Txt_Subject.Location = new System.Drawing.Point(118, 109);
            this.Txt_Subject.Name = "Txt_Subject";
            this.Txt_Subject.Size = new System.Drawing.Size(491, 21);
            this.Txt_Subject.TabIndex = 5;
            //
            // label3
            //
            this.label3.AutoSize = true;
            this.label3.Location = new System.Drawing.Point(50, 134);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(29, 12);
            this.label3.TabIndex = 6;
            this.label3.Text = "正文";
            //
            // webBrowser1
            //
            this.webBrowser1.Location = new System.Drawing.Point(52, 149);
            this.webBrowser1.MinimumSize = new System.Drawing.Size(20, 20);
            this.webBrowser1.Name = "webBrowser1";
            this.webBrowser1.Size = new System.Drawing.Size(722, 431);
            this.webBrowser1.TabIndex = 7;
            //
            // button1
            //
            this.button1.Location = new System.Drawing.Point(146, 605);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 8;
            this.button1.Text = "发送";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            //
            // Txt_CC
            //
            this.Txt_CC.Location = new System.Drawing.Point(118, 80);
            this.Txt_CC.Name = "Txt_CC";
            this.Txt_CC.Size = new System.Drawing.Size(491, 21);
            this.Txt_CC.TabIndex = 9;
            //
            // label4
            //
            this.label4.AutoSize = true;
            this.label4.Location = new System.Drawing.Point(62, 83);
            this.label4.Name = "label4";
            this.label4.Size = new System.Drawing.Size(29, 12);
            this.label4.TabIndex = 10;
            this.label4.Text = "抄送";
            //
            // button2
            //
            this.button2.Location = new System.Drawing.Point(671, 106);
            this.button2.Name = "button2";
            this.button2.Size = new System.Drawing.Size(103, 23);
            this.button2.TabIndex = 11;
            this.button2.Text = "导入发送信息";
            this.button2.UseVisualStyleBackColor = true;
            this.button2.Click += new System.EventHandler(this.button2_Click);
            //
            // SendMail
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(818, 643);
            this.Controls.Add(this.button2);
            this.Controls.Add(this.label4);
            this.Controls.Add(this.Txt_CC);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.webBrowser1);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.Txt_Subject);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.lb1);
            this.Controls.Add(this.Txt_To);
            this.Controls.Add(this.Txt_From);
            this.Name = "SendMail";
            this.Text = "SendMail";
            this.Load += new System.EventHandler(this.SendMail_Load);
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.TextBox Txt_From;
        private System.Windows.Forms.TextBox Txt_To;
        private System.Windows.Forms.Label lb1;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.TextBox Txt_Subject;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.WebBrowser webBrowser1;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.TextBox Txt_CC;
        private System.Windows.Forms.Label label4;
        private System.Windows.Forms.Button button2;
    }