C# 实现发送邮件

 /// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="smtp">发送服务地址smtp.163.com</param>
        /// <param name="sendAdress">发送人邮件地址</param>
        /// <param name="sendAdressPwd">发送人邮箱密码</param>
        /// <param name="toAddress">接收人邮箱</param>
        /// <param name="subject">标题</param>
        /// <param name="bodyText">发送内容</param>
        /// <param name="filePath">附件地址</param>
        /// <returns></returns>13         public string SendMail(string smtp, string sendAdress, string sendAdressPwd, string toAddress, string subject, string bodyText, string[] filePath)
        {
            //发送按钮的单击事件

            try
            {
                //确定smtp服务器地址。实例化一个Smtp客户端
                System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient(smtp);
                //生成一个发送地址
                string strFrom = string.Empty;

                //构造一个发件人地址对象
                MailAddress from = new MailAddress(sendAdress, "888888", Encoding.UTF8);
                //构造一个收件人地址对象
                MailAddress to = new MailAddress(toAddress, strFrom, Encoding.UTF8);

                //构造一个Email的Message对象
                MailMessage message = new MailMessage(from, to);
                if (filePath != null)
                {
                    //为 message 添加附件
                    foreach (string ss in filePath)
                    {
                        //得到文件名
                        string fileName = ss;
                        //判断文件是否存在
                        if (File.Exists(fileName))
                        {
                            //构造一个附件对象
                            Attachment attach = new Attachment(fileName);
                            //     得到文件的信息
                            ContentDisposition disposition = attach.ContentDisposition;
                            disposition.CreationDate = System.IO.File.GetCreationTime(fileName);
                            disposition.ModificationDate = System.IO.File.GetLastWriteTime(fileName);
                            disposition.ReadDate = System.IO.File.GetLastAccessTime(fileName);
                            //向邮件添加附件
                            message.Attachments.Add(attach);
                        }
                        else
                        {
                            //MessageBox.Show("文件" + fileName + "未找到！");
                        }
                    }
                }

                //添加邮件主题和内容
                message.Subject = subject;
                message.SubjectEncoding = Encoding.UTF8;
                message.Body = bodyText;
                message.BodyEncoding = Encoding.UTF8;

                //设置邮件的信息
                client.DeliveryMethod = SmtpDeliveryMethod.Network;
                message.BodyEncoding = System.Text.Encoding.UTF8;
                message.IsBodyHtml = false;

                ////如果服务器支持安全连接，则将安全连接设为true。
                ////gmail支持，163不支持，如果是gmail则一定要将其设为true
                //if (cmbBoxSMTP.SelectedText == "smpt.163.com")
                //    client.EnableSsl = false;
                //else
                //    client.EnableSsl = true;

                //设置用户名和密码。
                //string userState = message.Subject;
                client.UseDefaultCredentials = false;
                string username = sendAdress;
                string passwd = sendAdressPwd;
                //用户登陆信息
                NetworkCredential myCredentials = new NetworkCredential(username, passwd);
                client.Credentials = myCredentials;
                //发送邮件
                client.Send(message);
                //提示发送成功
                return "成功";
            }
            catch (Exception ex)
            {
                return "失败\r\n" + ex.ToString();
            }

        }