C# 发送邮件例程

using System;
using System.Net.Mail;
using System.IO;
/// <summary>
/// Utilities 的摘要说明
/// </summary>
public static class Utilities
{
static Utilities()
{
   //
   // TODO: 在此处添加构造函数逻辑
   //
}

    //读取指定URL地址的HTML，用来以后发送网页用
    public static string ScreenScrapeHtml(string url)
    {
        StreamReader reader = new StreamReader(System.Net.WebRequest.Create(url).GetResponse().GetResponseStream());
        string str = reader.ReadToEnd();
        reader.Close();
        return str;
    }

    ///   <summary>
    ///   发送邮件
    ///   </summary>
    ///   <param   name= "server "> smtp地址 </param>
    ///   <param   name= "username "> 用户名 </param>
    ///   <param   name= "password "> 密码 </param>
    ///   <param   name= "from "> 发信人地址 </param>
    ///   <param   name= "to "> 收信人地址 </param>
    ///   <param   name= "subject "> 邮件标题 </param>
    ///   <param   name= "body "> 邮件正文 </param>
    ///    <param   name= "IsHtml "> 是否是HTML格式的邮件 </param>
    public static void SendMail(string from,string to,string subject,string body,string server,string username,string password,bool IsHtml)
    {
        //设置SMTP 验证
        SmtpClient mailClient =new SmtpClient(SiteConfiguration.MailServer);
       
        //表示当前登陆用户的默认凭据进行身份验证，并且包含用户名密码
        mailClient.UseDefaultCredentials = true;
        mailClient.Credentials = new System.Net.NetworkCredential(username, password);
      
        //指定如何发送电子邮件。
        //Network         电子邮件通过网络发送到   SMTP   服务器。    
        //PickupDirectoryFromIis   将电子邮件复制到挑选目录，然后通过本地   Internet   信息服务   (IIS)   传送。    
        //SpecifiedPickupDirectory 将电子邮件复制到 SmtpClient.PickupDirectoryLocation 属性指定的目录，然后由外部应用程序传送。   

        client.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;


        //创建邮件对象
        MailMessage mailMessage =new MailMessage(from,to,subject,body);

       //定义邮件正文，主题的编码方式
        mailMessage.BodyEncoding =System.Text.Encoding.GetEncoding("gb2312");
        mailMessage.SubjectEncoding=System.Text.Encoding.GetEncoding("gb2312");

        //获取或者设置一个值，该值表示电子邮件正文是否为HTML
        mailMessage.IsBodyHtml = IsHtml;

        //指定邮件的优先级
        mailMessage.Priority = MailPriority.Normal;

        /*
        //   //添加附件
        //System.Web.Mail.MailAttachment   mailAttachment=new   System.Web.Mail.MailAttachment(@ "f:/att.txt ");  
        if (strFileName != " " && strFileName != null)
        {
            Attachment data = new Attachment(strFileName);
            mailMessage.Attachments.Add(data);
        }
         */

        //发件人身份验证,否则163   发不了
        client.Credentials = new System.Net.NetworkCredential(strFrom, Password);
       
        //发送
        mailClient.Send(mailMessage);
    }

    //发送plaintxt
    public static void SendText(string from, string to, string subject, string body, string server, string username, string password)
    {
        SendMail(from, to, server, username, password, false);
    }

    //发送HTML内容
    public static void SendHtml(string from, string to, string subject, string body, string server, string username, string password)
    {
        SendMail(from, to, server, username, password, true);
    }

    //发送制定网页
    public static void SendWebUrl(string from, string to, string subject, string body, string server, string username, string password,string url)
    {
        //发送制定网页
        SendHtml(from, to, subject, ScreenScrapeHtml(url), server, username, password);

    }
}