using System.Net.Mail;

 using System.Text;

 using System.Net;

    #region 邮件发送

         /// <summary>

         /// 邮件发送

         /// </summary>

         /// <param name="str">字符串</param>

         /// <returns></returns>

         public static string SendMail(string mailtitle, string mailcontent, string toemail, string toname)

         {

             ////设置发件人信箱,及显示名字

             MailAddress from = new MailAddress("xxx@xxx.com", "xxx");

             //设置收件人信箱,及显示名字

             MailAddress to = new MailAddress(toemail, toname);

             //创建一个MailMessage对象

             MailMessage oMail = new MailMessage(from, to);

             oMail.Subject = mailtitle; //邮件标题

             oMail.Body = mailcontent; //邮件内容

             oMail.IsBodyHtml = true; //指定邮件格式,支持HTML格式

             oMail.BodyEncoding = System.Text.Encoding.GetEncoding("GB2312");//邮件采用的编码

             oMail.Priority = MailPriority.High;//设置邮件的优先级为高

             //发送邮件服务器

             SmtpClient client = new SmtpClient();

             client.Host = "mail.xxxx.com"; //指定邮件服务器

             client.Credentials = new NetworkCredential("xxx@xxxx.com", "xxxxx");//指定服务器邮件,及密码

             //发送

             try

             {

                 client.Send(oMail); //发送邮件

                 oMail.Dispose(); //释放资源

                 return "";

             }

             catch (Exception ex)

             {

                 oMail.Dispose(); //释放资源

                 return ex.Message;

             }

         }

         #endregion

         #region   自定义邮件发送

         /// <summary>

         /// 邮件发送

         /// </summary>

         /// <param name="str">字符串</param>

         /// <returns></returns>

         public static string SendMail(string fromEmail,string fromName,string host,string username,string password,string mailtitle, string mailcontent, string toemail, string toname)

         {

             ////设置发件人信箱,及显示名字

             MailAddress from = new MailAddress(fromEmail, fromName);

             //设置收件人信箱,及显示名字

             MailAddress to = new MailAddress(toemail, toname);

             //创建一个MailMessage对象

             MailMessage oMail = new MailMessage(from, to);

             oMail.Subject = mailtitle; //邮件标题

             oMail.Body = mailcontent; //邮件内容

             oMail.IsBodyHtml = true; //指定邮件格式,支持HTML格式

             oMail.BodyEncoding = System.Text.Encoding.GetEncoding("GB2312");//邮件采用的编码

             oMail.Priority = MailPriority.High;//设置邮件的优先级为高

             //发送邮件服务器

             SmtpClient client = new SmtpClient();

             client.Host = host; //指定邮件服务器

             client.Credentials = new NetworkCredential(username,password);//指定服务器邮件,及密码

             //发送

             try

             {

                 client.Send(oMail); //发送邮件

                 oMail.Dispose(); //释放资源

                 return "";

             }

             catch (Exception ex)

             {

                 oMail.Dispose(); //释放资源

                 return ex.Message;

             }

         }

         #endregion