Question

好日子，伙计们，我有一个代码用于发送带有附件的电子邮件，我从Finding the exact cause for the exception - System.Net.Sockets.SocketException

引用了该附件

以下是代码：

namespace SendEmail
{
    class Email
    {
        public static void Main(string[] args)
        {
            MailMessage mail = new MailMessage();
            SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
            try
            {
                mail.From = new MailAddress("harish.1138@gmail.com");
                mail.To.Add("harish_1138@yahoo.com");
                mail.Subject = "Test Mail - 1";
                mail.Body = "mail with attachment";

                System.Net.Mail.Attachment attachment;
                attachment = new System.Net.Mail.Attachment("C:\\EmailTest.xlsx");
                mail.Attachments.Add(attachment);

                SmtpServer.Port = 587;
                SmtpServer.Credentials = new System.Net.NetworkCredential("harish.1138@gmail.com", "SamplePWD");
                SmtpServer.EnableSsl = true;

                SmtpServer.Send(mail);
                MessageBox.Show("Mail Sent");

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }
    }
}

当我执行此操作时，我得到一个例外：

消息=＆＃34; SMTP服务器需要安全连接或客户端未经过身份验证。服务器响应为：5.5.1需要身份验证。在＆＃34;

了解详情

如何修复身份验证所需的异常。这是否意味着阻止我发送电子邮件？

非常感谢

Answer 1

抛出此异常，当您无法访问SMTP服务器时。

通常您使用密码和用户名登录电子邮件，当涉及到SMTP服务器请求时，您将IP作为登录凭据发送。

如果您的IP未获得授权，则不会允许您使用该IP并将被阻止。

您需要提供凭据，以覆盖IP身份验证：

 SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
    SmtpServer .Host = "mail.youroutgoingsmtpserver.com";
    SmtpServer Credentials = new System.Net.NetworkCredential("yourusername", "yourpassword");

如果它不允许您，则谷歌会阻止您访问。

使用此参考：

Google mail api

Answer 2

我让它工作...... 这里提到：The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required? 正如@ymonad所建议的那样。

namespace SendEmail
{
    class Email
    {
        public static void Main(string[] args)
        {
            try
            {
                using (MailMessage mail = new MailMessage())
                {
                    mail.From = new MailAddress("harish.1138@gmail.com");
                    mail.To.Add("harish_1138@yahoo.com");
                    mail.Subject = "Test Mail - 1";
                    mail.Body = "mail with attachment";

                    System.Net.Mail.Attachment attachment;
                    attachment = new System.Net.Mail.Attachment("C:\\EmailTest.xlsx");
                    mail.Attachments.Add(attachment);

                    using (SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com", 587))
                    {
                        SmtpServer.UseDefaultCredentials = false; //Need to overwrite this
                        SmtpServer.Credentials = new System.Net.NetworkCredential("harish.1138@gmail.com", "SamplePWD");
                        SmtpServer.EnableSsl = true;
                        SmtpServer.Send(mail);
                    }
                }

                MessageBox.Show("Mail Sent");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }
    }
}

并且必须打开不太安全的应用程序，如下所示： https://stackoverflow.com/a/38024407/5266708

它完美无缺......

发送带附件的电子邮件

2 个答案: