命令顺序错误。服务器响应是：此邮件服务器在尝试发送到非本地电子邮件时需要身份验证

Question

我正在尝试在 asp.net 中发送，所以我有一个函数，如您在此处看到的：

public void SendEmail(string subject, string messageBody, string toAddress)
        {
            bool ssl = false;

            Repository.EmailConfRepository emailConf=new EmailConfRepository();
            DomainClass.EmailConfiguration e = emailConf.GetAll().First();
            if (e.EnableSsl == "true") ssl = true;
            MailMessage mail = new MailMessage();
            mail.To.Add(toAddress);
            mail.From = new MailAddress(e.EmailFrom);
            mail.Subject = subject;
            string Body = messageBody;
            mail.Body = Body;
            mail.IsBodyHtml = true;
            SmtpClient smtp = new SmtpClient();
            smtp.UseDefaultCredentials = false;
            smtp.Host = e.SmtpServer;
            smtp.Credentials = new System.Net.NetworkCredential
                (e.Username, e.Password);

            smtp.Port = int.Parse(e.SmtpPort);
            smtp.EnableSsl = ssl;
            smtp.Send(mail);
        }

当我调用此函数时，我收到此错误：

Bad sequence of commands. The server response was: This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server.

异常详细信息：

Exception Details: System.Net.Mail.SmtpException: Bad sequence of commands. The server response was: This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server

Answer 1

解决方案是在 web.config 上写入电子邮件所在位置的正确参数。

<system.net>
 <mailSettings>
  <smtp from=from@yourdomain.com>
  <network host="localhost" password="" userName=""/>
  </smtp>
 </mailSettings>
</system.net>

现在，如果您的服务器向本地主机发件人授予权限，您不需要密码和用户名，但如果不在那里放置您的电子邮件信息