服务器响应是: 5.7.0 必须首先发出 STARTTLS 命令.i16sm1806350pag.18 - gsmtp [英] The server response was: 5.7.0 Must issue a STARTTLS command first. i16sm1806350pag.18 - gsmtp

问题描述

我正在尝试使用 gmail 发送邮件，但遇到异常 SMTP 服务器需要安全连接或客户端未通过身份验证.服务器响应是: 5.7.0 必须首先发出 STARTTLS 命令.i16sm1806350pag.18 - gsmtp

I am trying to send mail using gmail, and I am getting an exception that is The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first. i16sm1806350pag.18 - gsmtp

我为发送邮件编写的代码是:

code I have written for sending mail is:

MailMessage mail = new MailMessage(); 
mail.To.Add(txtEmail.Text.Trim()); 
mail.To.Add("[e-mail]");
mail.From = new MailAddress("[e-mail]");
mail.Subject = "Confirmation of Registration on Job Junction.";
string Body = "Hi, this mail is to test sending mail using Gmail in ASP.NET";
mail.Body = Body;
mail.IsBodyHtml = true;
SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587);
// smtp.Host = "smtp.gmail.com"; //Or Your SMTP Server Address
smtp.Credentials = new System.Net.NetworkCredential("[e-mail]", "password");
// smtp.Port = 587;
//Or your Smtp Email ID and Password
smtp.UseDefaultCredentials = false;
// smtp.EnableSsl = true;
smtp.Send(mail);

请告诉我解决方案，我没有针对此异常的任何解决方案.

Please tell me solutions, I am not getting any solutions for this exception.

推荐答案

步骤(1): smtp.EnableSsl = true;

如果还不够:

步骤 (2): 必须使用 为 NetworkCredential 使用的 Gmail 帐户启用访问不太安全的应用程序"href="https://www.google.com/settings/u/1/security/lesssecureapps" rel="noreferrer">google 的设置页面:

Step (2): "Access for less secure apps" must be enabled for the Gmail account used by the NetworkCredential using google's settings page:

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