C# Email邮件发送，功能是密码找回或者重置功能。

using System;
using System.Collections.Generic;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Net.Mail;
using System.Text;
using System.Web;

namespace CalslNum.Helper
{
/// <summary>
///发送邮件类
/// </summary>
public class MailService
{
/// <summary>
/// 发送邮件程序调用方法 SendMail("abc@126.com", "某某人", "cba@126.com", "你好", "我测试下邮件", "邮箱登录名", "邮箱密码", "smtp.126.com", true,);
/// </summary>
/// <param name="from">发送人邮件地址</param>
/// <param name="fromname">发送人显示名称</param>
/// <param name="to">发送给谁（邮件地址）</param>
/// <param name="subject">标题</param>
/// <param name="body">内容</param>
/// <param name="username">邮件登录名</param>
/// <param name="password">邮件密码</param>
/// <param name="server">邮件服务器 smtp服务器地址</param>
/// <param   name= "IsHtml "> 是否是HTML格式的邮件 </param>
/// <returns>send ok</returns>
public static bool SendMail(string from, string fromname, string to, string subject, string body, string server, string username, string password, bool IsHtml)
{
//邮件发送类
MailMessage mail = new MailMessage();
try
{
//是谁发送的邮件
mail.From = new MailAddress(from, fromname);
//发送给谁
mail.To.Add(to);
//标题
mail.Subject = subject;
//内容编码
mail.BodyEncoding = Encoding.Default;
//发送优先级
mail.Priority = MailPriority.High;
//邮件内容
mail.Body = body;
//是否HTML形式发送
mail.IsBodyHtml = IsHtml;
//邮件服务器和端口
SmtpClient smtp = new SmtpClient(server, 25);
smtp.UseDefaultCredentials = true;
//指定发送方式
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
//发件人身份验证,否则163   发不了
smtp.UseDefaultCredentials = true;
//指定登录名和密码
smtp.Credentials = new System.Net.NetworkCredential(username, password);
//超时时间
smtp.EnableSsl = false;
smtp.Timeout = 10000;
smtp.Send(mail);
return true;
}
catch (Exception)
{
return false;
}
finally
{
mail.Dispose();
}
}

//读取指定URL地址的HTML，用来以后发送网页用
public static string ScreenScrapeHtml(string url)
{
//读取stream并且对于中文页面防止乱码
StreamReader reader = new StreamReader(System.Net.WebRequest.Create(url).GetResponse().GetResponseStream(), System.Text.Encoding.UTF8);
string str = reader.ReadToEnd();
reader.Close();
return str;
}

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

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

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

}
//默认发送格式
public static bool SendEmailDefault(string ToEmail,string f_username,string f_pass,string f_times)
{
StringBuilder MailContent = new StringBuilder();
MailContent.Append("亲爱的×××会员：<br/>");
MailContent.Append("    您好！你于");
MailContent.Append(DateTime.Now.ToString("yyyy-MM-dd HH:MM:ss"));
MailContent.Append("通过<a href='#'>×××</a>管理中心审请找回密码。<br/>");
MailContent.Append("　　　为了安全起见，请用户点击以下链接重设个人密码：<br/><br/>");
string url = "http://www.×××.×××/SignIn/Rest?u=" + f_username + "&s=" + f_pass + "&t=" + f_times;  MailContent.Append("<a href='" + url + "'>" + url + "</a><br/><br/>");  MailContent.Append(" (如果无法点击该URL链接地址，请将它复制并粘帖到浏览器的地址输入框，然后单击回车即可。)");  return SendHtml(ConfigurationManager.AppSettings["EmailName"].ToString(), "会员管理中心", ToEmail, "×××找回密码", MailContent.ToString(), ConfigurationManager.AppSettings["EmailService"].ToString(), ConfigurationManager.AppSettings["EmailName"].ToString(), ConfigurationManager.AppSettings["EmailPass"].ToString()); //这是从webconfig中自己配置的。  }  }  }

webconfig配置信息

<add key="EmailName" value="××××@163.com"/>
<add key="EmailPass" value="××××"/>
<add key="EmailService" value="smtp.163.com"/>

//说明： 这里面的"EmailService"得与你自己设置邮箱的smtp/POP3/...服务要相同， 大部分是根据@后面的进行配置。我是用163邮箱配置的。 可以根据自己需要自己配置。

后台调用的方法

public ActionResult SendEmail(string EmailName)
{
EmailName = Helper.FI_DesTools.DesDecrypt(EmailName);
if (!Regex.IsMatch(EmailName, @"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"))
{
return Content("0");
}
string f_username = "";
string f_pass = "";
string f_times = Helper.FI_DesTools.DesEncrypt(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
List<user> list = (from a in users where a.emailaddress == EmailName select a).ToList();
if (list.Count > 0)
{
f_username = Helper.FI_DesTools.DesEncrypt(list[0].×××);
f_pass = Helper.FI_DesTools.DesEncrypt(list[0].×××);

bool flag = Helper.MailService.SendEmailDefault(EmailName, “×××”,“×××”, “×××”);  //这里面的参数根据自己需求自己定，最好进行加密
if (flag)
{
return Content("true");
}
else
{
return Content("false");
}
}
else {
return Content("false");
}
}