C# 通过 SMTP 客户端发送电子邮件时出错
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Error in Sending Email via a SMTP Client
提问by Sike12
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.
这对您来说可能很微不足道，但我只是不明白为什么我在运行代码时会收到此错误消息。我在同一个网站上查看了一些相关问题，例如 使用 C# 通过 Gmail SMTP 服务器发送电子邮件，但没有一个有帮助。请问有人愿意帮忙吗？使用不同的组件也是可以接受的。所以如果有人得到一个可行的解决方案，我们将不胜感激。
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
错误消息 = SMTP 服务器需要安全连接或客户端未通过身份验证。服务器响应为：5.5.1 需要身份验证。了解更多
here is my code
这是我的代码
System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage();
message.From = new MailAddress("[email protected]");
message.To.Add("[email protected]");
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);
采纳答案by Pete
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:
除了电子邮件地址之外，我认为您的代码没有任何问题。我使用此代码成功地从 gmail 向我的个人帐户发送了一封电子邮件（实际上是在 LINQPad 中运行的）。只需将 3 个字符串值替换为您帐户的有效值，您就可以开始使用了：
MailMessage message = new System.Net.Mail.MailMessage();
string fromEmail = "[email protected]";
string fromPW = "mypw";
string toEmail = "[email protected]";
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);
}
回答by John
By this post.
通过这个帖子。
MailMessage mail = new MailMessage("[email protected]", "[email protected]");
SmtpClient client = new SmtpClient();
client.Port = 25;
client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.UseDefaultCredentials = false;
client.Host = "smtp.google.com";
mail.Subject = "this is a test email.";
mail.Body = "this is my test email body";
client.Send(mail);
