SMTP 服务器需要安全连接或客户端未通过身份验证 [英] The SMTP server requires a secure connection or the client was not authenticated

问题描述

我收到了这个错误

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. e17sm974159fak.34

Web.config

<mailSettings>
    <smtp deliveryMethod="Network"
                from="[e-mail]">
        <network defaultCredentials="false" host="smtp.gmail.com" port="587"
                    userName="[e-mail]"  password="12345678" />
    </smtp>        
</mailSettings>

代码文件

public void Submit()
        {
            EnsureCurrentlyValid();
            // Send via email
            var message = new StringBuilder();
            message.AppendFormat("Date: {0:yyyy-MM-dd hh:mm}
", DateTime.Now);
            message.AppendFormat("Email from: {0}
", Name);
            message.AppendFormat("Email: {0}
", Email);
            message.AppendFormat("Message: {0}
", Message);
            SmtpClient smtpClient = new SmtpClient();
            MailMessage m = new MailMessage(
                "[e-mail]", // From
                "[e-mail]", // To
                "Suggestion/Comments", // Subject
                message.ToString()); // Body

            smtpClient.Send(m);
        }

推荐答案

尝试设置 EnableSsl 属性为真:

Try setting the EnableSsl property to true:

smtpClient.EnableSsl = true;

AFAIK 这个属性只能在代码中设置，不能在配置文件中指定.

AFAIK this property can only be set in code and cannot be specified in the config file.

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