ASP.NET 实现邮件发送和接受的功能（Mail）

<% @ Page language="c#" Codebehind="WebMail.aspx.cs" AutoEventWireup="false" Inherits="MymailSys.WebMail"  %>
<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"  >
< HTML >
     < HEAD >
         < title > WebForm1 </ title >
         < meta  content ="Microsoft Visual Studio .NET 7.1"  name ="GENERATOR" >
         < meta  content ="C#"  name ="CODE_LANGUAGE" >
         < meta  content ="JavaScript"  name ="vs_defaultClientScript" >
         < meta  content ="http://schemas.microsoft.com/intellisense/ie5"  name ="vs_targetSchema" >
     </ HEAD >
     < body  MS_POSITIONING ="GridLayout" >
         < form  id ="Form1"  method ="post"  runat ="server"  enctype ="multipart/form-data" >
             < FONT  face ="宋体" >
                 < asp:label  id ="Label2"  style ="Z-INDEX: 101; LEFT: 224px; POSITION: absolute; TOP: 16px"  runat ="server"  Width ="292px"  Font-Names ="隶书"  Font-Size ="XX-Large" > 邮件发送系统 </ asp:label >
                 < TABLE  id ="Table1"  style ="Z-INDEX: 102; LEFT: 80px; WIDTH: 606px; POSITION: absolute; TOP: 96px; HEIGHT: 341px"  cellSpacing ="1"  cellPadding ="1"  width ="606"  align ="left"  border ="1" >
                     < TR >
                         < TD  style ="WIDTH: 178px; HEIGHT: 21px"  colSpan ="2" >< asp:label  id ="lblShowMsg"  runat ="server"  Width ="99px"  ForeColor ="Red" ></ asp:label ></ TD >
                         < TD  style ="WIDTH: 178px; HEIGHT: 21px" >< FONT  face ="宋体" ></ FONT ></ TD >
                     </ TR >
                     < TR >
                         < TD  style ="WIDTH: 122px" >< asp:label  id ="Label1"  runat ="server"  Width ="92px" > 发件人： </ asp:label ></ TD >
                         < TD >< asp:textbox  id ="tbFrom"  runat ="server" ></ asp:textbox ></ TD >
                         < TD >< asp:requiredfieldvalidator  id ="RequiredFieldValidator1"  runat ="server"  Width ="156px"  ControlToValidate ="tbFrom"  ErrorMessage ="发件人不能为空！"  Height ="26px" ></ asp:requiredfieldvalidator ></ TD >
                     </ TR >
                     < TR >
                         < TD  style ="WIDTH: 122px" >< FONT  face ="宋体" > 收件人： </ FONT ></ TD >
                         < TD >< asp:textbox  id ="tbTo"  runat ="server" ></ asp:textbox ></ TD >
                         < TD >< FONT  face ="宋体" >< asp:requiredfieldvalidator  id ="RequiredFieldValidator2"  runat ="server"  Width ="152px"  ControlToValidate ="tbTo"  ErrorMessage ="收件人不能为空！"  Height ="26px" ></ asp:requiredfieldvalidator ></ FONT ></ TD >
                     </ TR >
                     < TR >
                         < TD  style ="WIDTH: 122px" >< FONT  face ="宋体" > 邮件主题： </ FONT ></ TD >
                         < TD >< asp:textbox  id ="tbSubject"  runat ="server" ></ asp:textbox ></ TD >
                         < TD >< asp:requiredfieldvalidator  id ="RequiredFieldValidator3"  runat ="server"  Width ="160px"  ControlToValidate ="tbSubject"  ErrorMessage ="邮件主题不能为空！"  Height ="26px" ></ asp:requiredfieldvalidator ></ TD >
                     </ TR >
                     < TR >
                         < TD  style ="WIDTH: 122px" > 邮件服务器: </ TD >
                         < TD >< asp:textbox  id ="tbServer"  runat ="server" ></ asp:textbox ></ TD >
                         < TD ></ TD >
                     </ TR >
                     < TR >
                         < TD  style ="WIDTH: 122px" > 邮件用户名称: </ TD >
                         < TD >< asp:textbox  id ="tbUserName"  runat ="server" ></ asp:textbox ></ TD >
                         < TD >< asp:requiredfieldvalidator  id ="RequiredFieldValidator5"  runat ="server"  ControlToValidate ="tbUserName"  ErrorMessage ="用户名不能为空!" ></ asp:requiredfieldvalidator ></ TD >
                     </ TR >
                     < TR >
                         < TD  style ="WIDTH: 122px" > 密码: </ TD >
                         < TD >< asp:textbox  id ="tbPass"  runat ="server"  TextMode ="Password" ></ asp:textbox ></ TD >
                         < TD >< asp:requiredfieldvalidator  id ="RequiredFieldValidator6"  runat ="server"  ControlToValidate ="tbPass"  ErrorMessage ="密码不能为空!" ></ asp:requiredfieldvalidator ></ TD >
                     </ TR >
                     < TR >
                         < TD  style ="WIDTH: 122px" >< FONT  face ="宋体" > 优先级:
                                 < asp:dropdownlist  id ="ddlp"  runat ="server" >
                                     < asp:ListItem  Value ="高" > 高 </ asp:ListItem >
                                     < asp:ListItem  Value ="低" > 低 </ asp:ListItem >
                                     < asp:ListItem  Value ="普通" > 普通 </ asp:ListItem >
                                 </ asp:dropdownlist ></ FONT ></ TD >
                         < TD >< FONT  face ="宋体" > 邮件格式：
                                 < asp:dropdownlist  id ="ddlB"  runat ="server" >
                                     < asp:ListItem  Value ="Text" > Text </ asp:ListItem >
                                     < asp:ListItem  Value ="Html" > Html </ asp:ListItem >
                                 </ asp:dropdownlist ></ FONT ></ TD >
                         < TD ></ TD >
                     </ TR >
                     < TR >
                         < TD  style ="WIDTH: 122px" > 邮件附件： </ TD >
                         < TD  colSpan ="2" >< INPUT  id ="FileSelect"  style ="WIDTH: 282px; HEIGHT: 22px"  type ="file"  size ="27"  name ="File1"  runat ="server" ></ TD >
                     </ TR >
                     < TR >
                         < TD  style ="WIDTH: 178px"  colSpan ="3" >< FONT  face ="宋体" > 邮件内容： </ FONT ></ TD >
                     </ TR >
                     < TR >
                         < TD  style ="WIDTH: 178px"  colSpan ="3" >< FONT  face ="宋体" >< asp:textbox  id ="tbBody"  runat ="server"  Width ="594px"  Height ="167px"  TextMode ="MultiLine" ></ asp:textbox ></ FONT ></ TD >
                     </ TR >
                     < TR >
                         < TD  style ="WIDTH: 235px"  colSpan ="3" >< asp:button  id ="btnSubmit"  runat ="server"  Text ="发送" ></ asp:button >< FONT  face ="宋体" ></ FONT ></ TD >
                     </ TR >
                 </ TABLE >
         </ form >
         </ FONT >
     </ body >
</ HTML >

using  System;
using  System.Collections;
using  System.ComponentModel;
using  System.Data;
using  System.Drawing;
using  System.Web;
using  System.Web.SessionState;
using  System.Web.UI;
using  System.Web.UI.WebControls;
using  System.Web.UI.HtmlControls;
using  System.Web.Mail;
namespace  MymailSys
{
    /// <summary>
    /// WebForm1 的摘要说明。
    /// </summary>
    public class WebMail : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.TextBox tbBody;
        protected System.Web.UI.WebControls.DropDownList ddlB;
        protected System.Web.UI.WebControls.DropDownList ddlp;
        protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator3;
        protected System.Web.UI.WebControls.TextBox tbSubject;
        protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator2;
        protected System.Web.UI.WebControls.TextBox tbTo;
        protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator1;
        protected System.Web.UI.WebControls.TextBox tbFrom;
        protected System.Web.UI.WebControls.Label Label1;
        protected System.Web.UI.WebControls.Label lblShowMsg;
        protected System.Web.UI.WebControls.Label Label2;
        protected System.Web.UI.HtmlControls.HtmlForm Form1;
        protected System.Web.UI.WebControls.TextBox tbServer;
        protected System.Web.UI.WebControls.TextBox tbUserName;
        protected System.Web.UI.WebControls.TextBox tbPass;
        protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator5;
        protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator6;
        protected System.Web.UI.WebControls.Button btnSubmit;
        protected System.Web.UI.HtmlControls.HtmlInputFile FileSelect;
        protected System.Web.UI.HtmlControls.HtmlForm Form2;
    
        private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面
        }

        Web 窗体设计器生成的代码

        private void btnSubmit_Click(object sender, System.EventArgs e)
        {
            //SmtpMail.Send("shaozhd@263.net","shaozhd@263.net","Test","Hello");
            MailMessage m = new MailMessage();
            m.From = tbFrom.Text;
            m.To = tbTo.Text;
            m.Subject = tbSubject.Text;
            m.Body = tbBody.Text;
            //优先级
            switch(ddlp.SelectedIndex)
            {
                case 0:
                    m.Priority = MailPriority.High;
                    break;
                case 1:
                    m.Priority = MailPriority.Low;
                    break;
                default:
                    m.Priority = MailPriority.Normal;
                    break;
            }
            //格式
            if(ddlp.SelectedIndex==0)
                m.BodyFormat = MailFormat.Text;
            else
                m.BodyFormat = MailFormat.Html;
            //以下设置服务器
            if(tbServer.Text!="")
            {
                SmtpMail.SmtpServer = tbServer.Text;
                //以下代码适用于Framework1.1以上版本。
//                m.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate",
//                    "1");    //basic authentication
//                m.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername",
//                    tbUserName.Text); //set your username here
//                m.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword",
//                    tbPass.Text);    //set your password here
            }
            //以下处理附件 
            string strFileName = FileSelect.PostedFile.FileName;
            if(strFileName!="")
                m.Attachments.Add(new MailAttachment(strFileName));
            SmtpMail.Send(m);
        }
    }
}

本文转自高海东博客园博客，原文链接：http://www.cnblogs.com/ghd258/archive/2005/10/22/259692.html，如需转载请自行联系原作者