C# 发送邮件

方法一：

 public static string SendMail2(string add_smtp, string acc_SendMail, string psw_SendMail, string add_SendMail, ArrayList arr_GetMail, ArrayList arr_CcMail, ArrayList arr_McMail, ArrayList arr_Att, string body, string subject, bool bodytype)
        {
            add_smtp = "实际地址";
            psw_SendMail = "密码";
            string result = "";
            System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient(add_smtp, 25);
            smtp.Credentials = new System.Net.NetworkCredential(acc_SendMail, psw_SendMail);
            System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();
            for (int s = 0; s < arr_GetMail.Count; s++)
            {
                mail.To.Add(arr_GetMail[s].ToString() + "");
            }

            //抄送
            for (int c = 0; c < arr_CcMail.Count; c++)
            {

                mail.CC.Add(arr_CcMail[c].ToString() + "");
            }


            //密送
            for (int c = 0; c < arr_McMail.Count; c++)
            {

                mail.Bcc.Add(arr_McMail[c].ToString() + "");
            }

            mail.SubjectEncoding = System.Text.Encoding.GetEncoding("GB2312");

            mail.BodyEncoding = System.Text.Encoding.GetEncoding("GB2312");

            mail.From = new System.Net.Mail.MailAddress(add_SendMail);

            mail.Priority = System.Net.Mail.MailPriority.Normal;

            mail.Subject = subject;

            mail.Body = body;


            mail.IsBodyHtml = bodytype;

            for (int d = 0; d < arr_Att.Count; d++)
            {
                System.Net.Mail.Attachment attachment = new System.Net.Mail.Attachment(arr_Att[d].ToString());

                mail.Attachments.Add(attachment);
            }

            try
            {
                smtp.Send(mail);

                result = "sucess";
            }
            catch (System.Net.Mail.SmtpException ex)
            {
                result = ex.Message + ex.Source;
            }

            finally
            {
                mail.Dispose();
            }
            return result;

        }

方法二：

/// <summary>
    /// 邮件发送辅助类
    /// </summary>
    public class MailHelper
    {
        /// <summary>
        /// 发送邮件 [如果发送失败，不添加重发]
        /// </summary>
        /// <param name="tomail">收件人</param>
        /// <param name="subject">主题</param>
        /// <param name="body">消息内容</param>
        public static void SendMail(string  tomail, string subject, string body,string mailFrom)
        {
            // 设置发送方的邮件信息,例如使用网易的smtp
            string smtpServer = "实际地址"; //SMTP服务器
            string user = "用户名";
            string userPassword = "密码";//登陆密码
            string mailTo = tomail;
            // 邮件服务设置
            SmtpClient smtpClient = new SmtpClient();
            smtpClient.Host = smtpServer; //指定SMTP服务器
            smtpClient.Port = 25;
            smtpClient.UseDefaultCredentials = false;
            smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;//指定电子邮件发送方式
            smtpClient.Credentials = new System.Net.NetworkCredential(mailFrom, userPassword);//用户名和密码


            // 发送邮件设置        
            MailMessage mailMessage = new MailMessage(mailFrom, mailTo); // 发送人和收件人
            mailMessage.Subject = subject;//主题
            mailMessage.Body = body;//内容
            mailMessage.BodyEncoding = Encoding.UTF8;//正文编码
            mailMessage.IsBodyHtml = true;//设置为HTML格式
           
            try
            {
                smtpClient.Send(mailMessage); // 发送邮件
            }
            catch (SmtpException ex)
            {
                throw ex;
            }
        }
    }