C# 使用 gmail 发送电子邮件。错误：服务器响应为：5.5.1 需要身份验证
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Send email using gmail. Error: The server response was: 5.5.1 Authentication Required
提问by ideas xchange
Sorry, I saw a lot of similar post regarding this matter but never found any solution to my problem, so I decided to post it.
抱歉，我看到很多关于这个问题的类似帖子，但从未找到任何解决我问题的方法，所以我决定发布它。
I am using ASP.NET c# to send email programmatically using gmail with the following code.
我正在使用 ASP.NET c# 通过以下代码使用 gmail 以编程方式发送电子邮件。
string EmailAddress = senderemail;
MailMessage mailMessage = new MailMessage(EmailAddress, EmailAddress);
mailMessage.Subject = "This is a test email";
mailMessage.Body = "This is a test email. Please reply if you receive it.";
SmtpClient smtpClient = new SmtpClient();
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpClient.EnableSsl = true;
smtpClient.Host = "smtp.gmail.com";
smtpClient.Port = 587;
smtpClient.Credentials = new System.Net.NetworkCredential()
{
UserName = EmailAddress,
Password = senderpassword
};
smtpClient.UseDefaultCredentials = false;
smtpClient.Send(mailMessage);
I received this error like everybody else
我和其他人一样收到了这个错误
Error:
错误：
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.
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。了解更多信息。
Already did below 2 action from GMAIL.
已经从 GMAIL 执行了以下 2 个操作。
-less secure app : turn on
- 不太安全的应用程序：打开
-2 step verification : off
-2 步验证：关闭
I don't care whether is this gmail account safe or what. I don't need any security for this account. What else should i do?
我不在乎这个 gmail 帐户是否安全或什么。我不需要此帐户的任何安全措施。我还应该做什么？
回答by ideas xchange
I ran this code in my machine,it works. Probably Commented Line Not needed.....
我在我的机器上运行了这段代码，它有效。可能注释行 不需要.....
MailMessage mailMessage = new MailMessage("From_User_Email", "To_Whom_Email");
mailMessage.Subject = "This is a test email";
mailMessage.Body = "This is a test email. Please reply if you receive it.";
SmtpClient smtpClient = new SmtpClient();
//smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpClient.EnableSsl = true;
smtpClient.Host = "smtp.gmail.com";
smtpClient.Port = 587;
smtpClient.Credentials = new System.Net.NetworkCredential()
{
UserName = "From_User_Email",
Password = "User_Password"
};
//smtpClient.UseDefaultCredentials = false;
smtpClient.Send(mailMessage);
回答by Tharif
Try the following code :
试试下面的代码：
UseDefaultCredentials = false;
Credentials = new NetworkCredential("[email protected]", "xxxpassword");
When you try to send mail from code and you find the error "The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required", than the error might occur due to the cases which are beutifully explained here,please have a look
当您尝试从代码发送邮件并发现错误“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”时，由于以下情况，可能会发生错误在这里解释得很清楚，请看一看
Also check blocked sign ins here,security devices setting here
Also you can try the below code :
您也可以尝试以下代码：
MailMessage mail = new MailMessage();
SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
mail.From = new MailAddress("[email protected]");
mail.To.Add("[email protected]");
mail.Subject = "xxxxx ";
mail.Body += " <html>";
mail.Body += "<body>";
mail.Body += "<table>";
mail.Body += "<tr>";
mail.Body += "<td>User Name : </td><td> Hai </td>";
mail.Body += "</tr>";
mail.Body += "<tr>";
mail.Body += "<td>Password : </td><td>xxxxxx</td>";
mail.Body += "</tr>";
mail.Body += "</table>";
mail.Body += "</body>";
mail.Body += "</html>";
mail.IsBodyHtml = true;
SmtpServer.Port = 587;
SmtpServer.Credentials = new
System.Net.NetworkCredential("[email protected]", "xxxpassword");
SmtpServer.EnableSsl = true;
SmtpServer.Send(mail);
Thanks
谢谢
回答by Krunal Mevada
This generally happens when you try login from different time zone/IP/Computer. You production server and the mail id you have used both are in different time zone. Choose any of the one solution:
当您尝试从不同的时区/IP/计算机登录时，通常会发生这种情况。您的生产服务器和您使用的邮件 ID 位于不同的时区。选择以下任一解决方案：
- Log in to production server via remote access, and sing in to gmail once with your credentials. They will ask for the confirmation, confirm it and log out.
- 通过远程访问登录到生产服务器，并使用您的凭据登录到 gmail 一次。他们将要求确认，确认并注销。
Or
或者
- Log in gmail to your local computer, Follow this Linkand choose review this activityand take proper actions.
回答by Hussein Zawawi
Login to the following gmail account using a browser and follow the validation process. You may have sent a lot of emails and the account was blocked temporary.
使用浏览器登录以下 Gmail 帐户并按照验证过程进行操作。您可能已经发送了很多电子邮件，并且该帐户被临时阻止。
回答by mqueirozcorreia
Make sure you have a strong password. I had the problem with gmail because my password had only letters and numbers. I changed to use Upper and lower case letters, numbers and symbols, now it is working: "Using numbers, symbols and mix of upper and lower case letters in your password makes it harder for someone to guess your password. For example, an eight-character password with numbers, symbols and mixed-case letters is harder to guess because it has 30,000 times as many possible combinations than an eight-character password with only lower case letters." https://support.google.com/accounts/answer/32040?hl=en
确保你有一个强密码。我在使用 gmail 时遇到了问题，因为我的密码只有字母和数字。我改为使用大写和小写字母、数字和符号，现在它可以工作了：“在密码中使用数字、符号和大小写字母的混合会使别人更难猜出你的密码。例如，一个 8 - 包含数字、符号和混合大小写字母的字符密码更难猜测，因为它的可能组合数是仅包含小写字母的八字符密码的 30,000 倍。” https://support.google.com/accounts/answer/32040?hl=en
回答by Kutty Rajesh Valangai
sign up Gmail and go to https://www.google.com/settings/security/lesssecureappswhere you can see settings. Access for less secure apps
注册 Gmail 并转到https://www.google.com/settings/security/lesssecureapps，您可以在其中查看设置。访问不太安全的应用程序
Turn off (default) ==> Turn On
关闭（默认）==> 打开
after add this code,
添加此代码后，
MailMessage mail = new MailMessage("[email protected]", "[email protected]");
mail.Subject = "TestEmailImportant";
mail.Body = "This mail is to test if this program is working";
SmtpClient smtpClient = new SmtpClient("smtp.gmail.com", 587);
smtpClient.Credentials = new System.Net.NetworkCredential()
{
UserName = "[email protected]",
Password = "YYYYYYYY"
};
smtpClient.EnableSsl = true;
System.Net.ServicePointManager.ServerCertificateValidationCallback = delegate(object s,
System.Security.Cryptography.X509Certificates.X509Certificate certificate,
System.Security.Cryptography.X509Certificates.X509Chain chain,
System.Net.Security.SslPolicyErrors sslPolicyErrors)
{
return true;
};
smtpClient.Send(mail);
回答by Batsuuri .G
My case was solved this this solution6
我的情况解决了这个解决方案6
Commit the following line:
提交以下行：
smtpClient.UseDefaultCredentials = false;
If it not working try port 25 instead of 578.
如果它不起作用，请尝试使用端口 25 而不是 578。
https://productforums.google.com/forum/#!topic/gmail/w8hNo56tivE;context-place=topicsearchin/gmail/The$20SMTP$20server$20requires$20a$20secure$20connection$20or$20the$20client$20was$20not$20authenticated.$20The$20server$20response$20was$3A$205.5.1$20Authentication$20Required
https://productforums.google.com/forum/#!topic/gmail/w8hNo56tivE;context-place=topicsearchin/gmail/$20SMTP$20server$20requires$20a$20secure$20connection$20或$20the$20client$20was$20不是$20authenticated。$20The$20server$20response$20was$3A$205.5.1$20Authentication$20Required
回答by Mostafa Kamel
Some times you only need to login gmail from this computer , if you did not login before from this PC . gmail will ask you to verify and confirm the new PC.
有时您只需要从这台计算机登录 gmail，如果您之前没有从这台 PC 登录。gmail 会要求您验证并确认新 PC。
回答by Sukanya Bhavanibatla
There is also a possibility that O365 is having the Multi Factor Authentication. Try generating the App password for your app and send email.
O365 也有可能具有多重身份验证。尝试为您的应用生成应用密码并发送电子邮件。
