C# 发送邮件类及示例 （不知是修改了哪位博主的了）

C#  的一个发送邮件的示例，我给的例子中还有类似类似验证的功能。 不过主要代码是修改某一个博客的，现在忘了。

class SendMailCls    {        /// <summary>         /// 发送邮件程序         /// </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</param>         /// <param name="fujian">附件</param>         /// <returns>send ok</returns>         /// 调用方法 SendMail("[e-mail]", "某某人", "[e-mail]", "你好", "我测试下邮件", "邮箱登录名", "邮箱密码", "smtp.126.com", ""); /*         示例         String msg=@"    <div><div style='margin:0 auto;border:1px solid #8e8e8e;width:700px;'><div style='border-bottom:2px solid #3276b1;margin:10px 20px;'><a href='hihocoder.com' target='_blank'><img src='http://static.hihocoder.com/images/logo.png' style='height: 36px;margin-bottom:5px;'></img></a></div><div style='padding:10px 20px;'><p style='color:#15C;'></p> 请您点击下面的链接(该链接在12小时内有效)，完成您在hihoCoder的验证<br></br><a href='http://hihocoder.com/user/acct-bind/vidy49dbn5nfw.ecaf4d23e2b9c58c61e3b497c9a942be' style='color:#15C;' target='_blank'> http://hihocoder.com/user/acct-bind/vidy49dbn5nfw.…</a><p style='margin:10px 0;'><a href='http://hihocoder.com/user/acct-bind/vidy49dbn5nfw.ecaf4d23e2b9c58c61e3b497c9a942be' style='color:#15C;' target='_blank'></a></p><span style='color:#999;font-size:12px;'> (如果链接无法点击，请复制黏贴到浏览器访问)</span><p style='padding-top:15px;font-size:12px;border-top:1px dashed #ccc;margin-top: 20px;color:#999;'> 本邮件由系统自动发出，请勿回复</p></div><div style='background:#F9F9F9;font-size: 12px;color:#999;border-top:1px solid #ccc;padding:10px 20px'> 您收到此邮件是因为您在hihoCoder使用第三方帐户登录并同意接受来自该网站的邮件。<br></br> 如有任何疑问，请登录www.hihocoder.com</div></div></div>            ";            SendMailCls sdm = new SendMailCls();            msg = sdm.SendMail("[e-mail]", "Computer Science Class 1105", "[e-mail]", "注册验证消息", msg, "[e-mail]", "xxx", "smtp.163.com", "");            Console.WriteLine(msg);         */        public string SendMail(string from,string fromname,string to,string subject,string body,string username,string password,string server,string fujian)         {            try            {                //邮件发送类                 MailMessage mail = new MailMessage();                //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 = System.Text.Encoding.UTF8; // 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 = true;                //附件                 if (fujian.Length > 0)                {                    mail.Attachments.Add(new Attachment(fujian));                }                //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;                //指定登录名和密码                 smtp.Credentials = new System.Net.NetworkCredential(username, password);                //超时时间                 smtp.Timeout = 10000;                smtp.Send(mail);                return "send ok";            }            catch (Exception exp) { return exp.Message; }         }           }