c# – 5.7.57 SMTP – 客户端未通过身份验证,无法在MAIL FROM错误期间发送匿名邮件

我必须使用我的网络应用程序发送邮件.鉴于以下代码显示SMTP服务器需要安全连接或客户端未经过身份验证.服务器响应是：

5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM.

帮我找一个合适的解决方案.谢谢.

码：

protected void btnsubmit_Click(object sender, EventArgs e)
 {

   Ticket_MailTableAdapters.tbl_TicketTableAdapter tc;
   tc = new Ticket_MailTableAdapters.tbl_TicketTableAdapter();
   DataTable dt = new DataTable();
   dt = tc.GetEmail(dpl_cate.SelectedValue);
   foreach (DataRow row in dt.Rows)
    {
    string eml = (row["Emp_Email"].ToString());
    var fromAddress = "emailAddress";
    var toAddress = eml;
    const string fromPassword = "*****";
    string body = "Welcome..";
 // smtp settings
    var smtp = new System.Net.Mail.SmtpClient();
       {
         smtp.Host = "smtp.office365.com";
         smtp.Port = 587;
         smtp.EnableSsl = true;

         smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
         smtp.Credentials = new NetworkCredential(fromAddress, fromPassword);
         smtp.UseDefaultCredentials = false;
         smtp.Timeout = 600000;
       }
  // Passing values to smtp object
     smtp.Send(fromAddress, toAddress, subject, body);
     }
  } 
 }

我可能不是一个优秀的程序员,但你似乎将From地址作为“emailAddress”传递,这不是一个合适的电子邮件地址,对于Office365来说,需要成为Office365系统上的真实地址.

如果您将电子邮件地址硬编码为from和office 365密码,则可以验证.当然,不要把它留在那里.