C#通用邮件发送类分享

此类的功能包括发送邮件，邮箱格式是否正确，和在不发送邮件的情况下判断邮箱用户名和密码是否正确，鉴于pop检查邮箱用户名和密码出现错误情况返回结果的延迟，用异步线程解决此问题，见代码：

using system;
using system.collections.generic;
using system.linq;
using system.text;
using system.net.mail;
using system.web;
using system.net;
using system.text.regularexpressions;
using system.net.sockets;
using system.io;
using system.collections;
using system.threading;

namespace com.web
{
  /// <summary>
  /// 邮箱类
  /// </summary>
  public class checkemailinfo
  {
    public string server { get; set; }//服务器
    public string user { get; set; }//用户名
    public string pwd { get; set; }//密码
  }

  /// <summary>
  /// sendemail通用类，通过smtp服务器发送邮件
  /// </summary>
  public class sendemail
  {
    public dictionary<string, string> smtpserver;
    public dictionary<string, string> popserver;

    public sendemail()
    {     
      inismtpserver();
      inipopserver();
    }

    /// <summary>
    /// 初始化常用smtpserver，用于绑定下拉选择菜单
    /// </summary>
    private void inismtpserver()
    {
      smtpserver = new dictionary<string, string>();
      smtpserver.add("网易163邮箱", "smtp.163.com");
      smtpserver.add("网易vip.163邮箱", "smtp.vip.163.com");
      smtpserver.add("网易126邮箱", "smtp.126.com");
      smtpserver.add("网易188邮箱", "smtp.188.com");
      smtpserver.add("新浪邮箱", "smtp.sina.com");
      smtpserver.add("雅虎邮箱", "smtp.mail.yahoo.com");
      smtpserver.add("搜狐邮箱", "smtp.sohu.com");
      smtpserver.add("tom邮箱", "smtp.tom.com");
      smtpserver.add("gmail邮箱", "smtp.gmail.com");
      smtpserver.add("qq邮箱", "smtp.qq.com");
      smtpserver.add("qq企业邮箱", "smtp.biz.mail.qq.com");
      smtpserver.add("139邮箱", "smtp.139.com");
      smtpserver.add("263邮箱", "smtp.263.com");      
    }

    /// <summary>
    /// 初始化常用popserver，用于绑定下拉选择菜单
    /// </summary>
    private void inipopserver()
    {
      popserver = new dictionary<string, string>();
      popserver.add("网易163邮箱", "pop3.163.com");
      popserver.add("网易vip.163邮箱", "pop3.vip.163.com");
      popserver.add("网易126邮箱", "pop3.126.com");
      popserver.add("网易188邮箱", "pop3.188.com");
      popserver.add("新浪邮箱", "pop3.sina.com");
      popserver.add("雅虎邮箱", "pop3.mail.yahoo.com");
      popserver.add("搜狐邮箱", "pop3.sohu.com");
      popserver.add("tom邮箱", "pop.tom.com");
      popserver.add("gmail邮箱", "pop.gmail.com");
      popserver.add("qq邮箱", "pop.qq.com");
      popserver.add("qq企业邮箱", "pop.biz.mail.qq.com");
      popserver.add("139邮箱", "pop.139.com");
      popserver.add("263邮箱", "pop.263.com");
    }

    /// <summary>
    /// 发送邮件功能
    /// </summary>
    /// <param name="fromemail">登录邮箱</param>
    /// <param name="password">登录密码</param>
    /// <param name="user">邮件昵称</param>
    /// <param name="title">邮件标题</param>
    /// <param name="toemail">邮件地址</param>
    /// <param name="email">邮件内容</param>
    /// <param name="smtpserver">smtp服务器</param>
    public bool sendmessage(string fromemail,string password, string user, string title, string toemail, string email,string smtpserver)
    {
      try
      {       
        smtpclient smtp = new smtpclient(); //实例化一个smtpclient
        smtp.deliverymethod = smtpdeliverymethod.network; //将smtp的出站方式设为 network
        smtp.enablessl = false;//smtp服务器是否启用ssl加密
        smtp.host = smtpserver;//指定 smtp 服务器          
        smtp.credentials = new networkcredential(fromemail, password);
        mailmessage mm = new mailmessage(); //实例化一个邮件类
        mm.priority = mailpriority.high; //邮件的优先级，分为 low, normal, high，通常用 normal即可       
        mm.from = new mailaddress(fromemail, user, encoding.getencoding(936));
        mm.cc.add(new mailaddress(toemail, "", encoding.getencoding(936)));
        mm.subject = title; //邮件标题
        mm.subjectencoding = encoding.getencoding(936);
        mm.isbodyhtml = true; //邮件正文是否是html格式mm.bodyencoding = encoding.getencoding(936);
        mm.body = email;
        smtp.send(mm);
        return true;     
      }
      catch
      {
        return false;
      }
    }

    /// <summary>
    /// 检查邮箱是否正确的委托
    /// </summary>
    delegate bool mydelegate(object checkemailinfo);

    /// <summary>
    /// 利用异步方式检查邮箱账号和密码是否正确
    /// </summary>
    public bool checkuser(string server, string user, string pwd)
    {      
      mydelegate mydelegate = new mydelegate(checkuser);
      checkemailinfo checkemailinfo = new checkemailinfo();
      checkemailinfo.server = server;
      checkemailinfo.user = user;
      checkemailinfo.pwd = pwd;
      iasyncresult result = mydelegate.begininvoke(checkemailinfo, null, null);
      thread.sleep(1000);//主线程1秒后检查异步线程是否运行完毕
      if (result.iscompleted)
      { return mydelegate.endinvoke(result); }//如果错误的邮箱和密码，函数将会运行很慢
      else
      { return false; }
    }
   

    /// <summary>
    /// 判断用户邮箱账号和密码是否正确
    /// </summary>
    /// <param name="server">popserver地址</param>
    /// <param name="user">用户名</param>
    /// <param name="pwd">密码</param>
    private bool checkuser(object checkemailinfo)
    {     
      checkemailinfo checkinfo = (checkemailinfo)checkemailinfo;
      tcpclient sender = new tcpclient(checkinfo.server, 110);//pop协议使用tcp的110端口
      byte[] outbytes;
      networkstream ns;
      streamreader sr;
      string input;
      string readuser = string.empty;
      string readpwd = string.empty;
      try
      {
        ns = sender.getstream();
        sr = new streamreader(ns);
        sr.readline();
        //检查用户名和密码
        input = "user " + checkinfo.user+ "\r\n";
        outbytes = encoding.ascii.getbytes(input.tochararray());
        ns.write(outbytes, 0, outbytes.length);       
        readuser = sr.readline();
        input = "pass " + checkinfo.pwd + "\r\n";
        outbytes =encoding.ascii.getbytes(input.tochararray());
        ns.write(outbytes, 0, outbytes.length);      
        readpwd = sr.readline();              
        if (readuser.substring(0, 3) == "+ok" && readpwd.substring(0, 3) == "+ok")
        { return true; }
        else
        { return false; }
      }
      catch
      {
        return false;
      }
    }
    
    /// <summary>
    /// 判断邮箱格式是否正确
    /// </summary>
    /// <param name="email">邮箱地址</param>
    public bool isemail(string email)
    { 
      string paterner = @"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*";
      if (!regex.ismatch(email, paterner))
      { return false;}
      else
      {return true;}     
    } 
  }
}