SMTP服务器需要安全连接或客户端未经过身份验证

Question

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文件

<mailSettings>
    <smtp deliveryMethod="Network"
                from="emailaccount@gmail.com">
        <network defaultCredentials="false" host="smtp.gmail.com" port="587"
                    userName="emailaccount@gmail.com"  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}\n", DateTime.Now);
            message.AppendFormat("Email from: {0}\n", Name);
            message.AppendFormat("Email: {0}\n", Email);
            message.AppendFormat("Message: {0}\n", Message);
            SmtpClient smtpClient = new SmtpClient();
            MailMessage m = new MailMessage(
                "visitor@mydomain.com", // From
                "emailaccount@gmail.com", // To
                "Suggestion/Comments", // Subject
                message.ToString()); // Body

            smtpClient.Send(m);
        }

Answer 1

尝试将EnableSsl属性设置为true:

smtpClient.EnableSsl = true;

AFAIK此属性只能在代码中设置,不能在配置文件中指定.

Answer 2

实际上,您可以通过添加enableSsl ="true"在web.config文件中处理此问题.这对我有用,我不需要在代码中做任何事情.

例如

<network host="smtp.gmail.com" enableSsl="true" ... />