C#代码发送邮件

本次测试的邮箱为163邮箱

1、首相对邮箱进行一些设置（详见下图）；打开设置选取客户端授权密码项，开启设置；以后在客户端登录时将使用刚刚设置的密码！

2、上干货

 public static void TestEmail2()
        {
            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.163.com ");
                //生成一个发送地址
                string strFrom = string.Empty;
                strFrom = "发送的邮箱@163.com";
                //构造一个发件人地址对象
                MailAddress from = new MailAddress(strFrom, "发件人", Encoding.UTF8);
                //构造一个收件人地址对象 例如123456@qq.com
                MailAddress to = new MailAddress("收件邮箱", "收件人", Encoding.UTF8);
                //构造一个Email的Message对象
                MailMessage message = new MailMessage(from, to);
                //得到文件名
                string fileName = @"附件文件地址";
                //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
                {
                    Log4Net.LogHelper.WriteLog(typeof(EmailService), "文件" + fileName + "未找到！");
                }
                //添加邮件主题和内容
                message.Subject = "主题";
                message.SubjectEncoding = Encoding.UTF8;
                message.Body = "邮件内容";
                message.BodyEncoding = Encoding.UTF8;
                //设置邮件的信息
                client.DeliveryMethod = SmtpDeliveryMethod.Network;
                message.BodyEncoding = System.Text.Encoding.UTF8;
                message.IsBodyHtml = false;

                //gmail支持，163不支持，如果是gmail则一定要将其设为true
                client.EnableSsl = false;

                //设置用户名和密码。
                client.UseDefaultCredentials = false;
                string username = "邮箱名（无163后缀）";
                string passwd = "刚刚设置的客户端授权码";
                //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
            }
            catch (Exception ex)
            {
                Log4Net.LogHelper.WriteLog(typeof(EmailService), ex.Message);
            }
        }