在通过SMTP客户端发送电子邮件错误 [英] Error in Sending Email via a SMTP Client

问题描述

这可能是非常平凡的你，但我就是不明白，为什么我会收到此错误信息，当我运行我的code。我看了一些相关问题上同样的网站，如<一个href="http://stackoverflow.com/questions/704636/sending-email-through-gmail-smtp-server-with-c-sharp">Sending通过Gmail SMTP服务器用C＃电子邮件 但他们都不是有帮助的。任何人都愿意帮助吗？ 使用不同的组件也是可以接受的。因此，如果任何人有一个工作的解决方案，这将是AP preciated。

  

错误信息= SMTP服务器要求安全连接或客户端未通过身份验证。服务器响应为：5.5.1要求进行验证。了解更多

这是我的code

  System.Net.Mail.MailMessage消息=新System.Net.Mail.MailMessage（）;
message.From =新MailAddress（[e-mail]）;
message.To.Add（[e-mail]）;
message.Subject =你好;
message.Body =你好鲍勃;
message.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;

SmtpClient smtpClient =新SmtpClient（smtp.gmail.com，587）;
smtpClient.EnableSsl = TRUE;
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpClient.UseDefaultCredentials = FALSE;
smtpClient.Credentials =新的NetworkCredential（MyGoogleMailAccount
                                               mygooglemailpassword）;

smtpClient.Send（message.From.ToString（），message.To.ToString（），
                message.Subject，message.Body）;
 

解决方案

我不认为有什么不对您的code比E-mail地址等。我用这个code到成功发送电子邮件从Gmail到我的个人账户（运行它在LINQPad，实际上）。只需更换与有效的值3的字符串值，您的帐户和你应该是好去：

  MailMessage消息=新System.Net.Mail.MailMessage（）;
字符串fromEmail =[e-mail];
字符串fromPW =mypw;
字符串toEmail =[e-mail];
message.From =新MailAddress（fromEmail）;
message.To.Add（toEmail）;
message.Subject =你好;
message.Body =你好鲍勃;
message.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;

使用（SmtpClient smtpClient =新SmtpClient（smtp.gmail.com，587））
{
    smtpClient.EnableSsl = TRUE;
    smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
    smtpClient.UseDefaultCredentials = FALSE;
    smtpClient.Credentials =新的NetworkCredential（fromEmail，fromPW）;

    smtpClient.Send（message.From.ToString（），message.To.ToString（），
                    message.Subject，message.Body）;
}
 

This may be very trivial for you but i just couldn't figure out why am i getting this error message when i run my code. I looked some of the relative questions on this same website for eg Sending email through Gmail SMTP server with C# but none of them was helpful. Anyone willing to help please? using different assemblies are also acceptable. so if anyone got a working solution that would be appreciated.

Error Message = The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at

here is my code

System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage();      
message.From = new MailAddress("[e-mail]");
message.To.Add("[e-mail]");
message.Subject = "Hello";
message.Body = "Hello Bob ";
message.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;

SmtpClient smtpClient = new SmtpClient("smtp.gmail.com", 587);
smtpClient.EnableSsl = true;
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpClient.UseDefaultCredentials = false;
smtpClient.Credentials = new NetworkCredential("MyGoogleMailAccount", 
                                               "mygooglemailpassword");

smtpClient.Send(message.From.ToString(), message.To.ToString(), 
                message.Subject, message.Body);   

解决方案

I don't think there's anything wrong with your code other than the e-mail addresses. I used this code to successfully send an e-mail from gmail to my personal account (ran it in LINQPad, actually). Simply replace the 3 string values with valid values for your accounts and you should be good to go:

MailMessage message = new System.Net.Mail.MailMessage(); 
string fromEmail = "[e-mail]";
string fromPW = "mypw";
string toEmail = "[e-mail]";
message.From = new MailAddress(fromEmail);
message.To.Add(toEmail);
message.Subject = "Hello";
message.Body = "Hello Bob ";
message.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;

using(SmtpClient smtpClient = new SmtpClient("smtp.gmail.com", 587))
{
    smtpClient.EnableSsl = true;
    smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
    smtpClient.UseDefaultCredentials = false;
    smtpClient.Credentials = new NetworkCredential(fromEmail, fromPW);

    smtpClient.Send(message.From.ToString(), message.To.ToString(), 
                    message.Subject, message.Body);   
}

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