在Web服务器上发送邮件的问题

你好，

我有一个联系我们表格，在我当地的主机上工作正常。但在将其上传到托管服务器后它无法正常工作。下面是我的代码。

hello,
i hava a contact us form that is working fine on my local host. but after uploading it to the hosting server it is not working . below is my code.

<div style="width:300px; margin-left:30px; float:left; height:auto;">
<h1>Feedback Form</h1><hr />
 <fieldset>
<legend>Contact us</legend>


<div>
<%--<asp:Label ID="Name" runat="server" Text="Your Name*:"/><br/>--%>
<asp:TextBox ID="txtName" runat="server" placeholder="Your Name" CssClass="twitterStyleTextbox"  /><br />
<asp:RequiredFieldValidator ID="RV1" runat="server"

                            ControlToValidate="txtName"  ForeColor=Red

                            ErrorMessage="Please Enter Your Name"

                            SetFocusOnError="True">
</asp:RequiredFieldValidator><br />
</div>

<div>
<%--<asp:Label ID="Email" runat="server" Text="Email*:"/><br/>--%>
<asp:TextBox ID="txtMail" runat="server" placeholder="Your Email Id" CssClass="twitterStyleTextbox"/><br />
<asp:RequiredFieldValidator ID="RV2" runat="server"

                            ControlToValidate="txtMail" ForeColor=Red

                            ErrorMessage="Your Email Address"

                            SetFocusOnError="True">
</asp:RequiredFieldValidator><asp:RegularExpressionValidator ID="RegularExpressionValidator1"

    runat="server" ErrorMessage="Please Enter valid Email Address"

    ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"

        ControlToValidate="txtMail" ForeColor="#FF3300"></asp:RegularExpressionValidator><br />
</div>

<div>
<%--<asp:Label ID="Sub" runat="server" Text="Subject*:"/><br/>--%>
<asp:TextBox ID="txtSubject" runat="server" placeholder="Subject" CssClass="twitterStyleTextbox"/><br />
<asp:RequiredFieldValidator ID="RV3" runat="server"

                            ControlToValidate="txtSubject" ForeColor=Red

                            ErrorMessage="Reason to contact us"

                            SetFocusOnError="True">
</asp:RequiredFieldValidator><br />
</div>

<div>
<%--<asp:Label ID="Message" runat="server" Text="Feedback:"/><br/>--%>
<asp:TextBox ID="txtMessage" runat="server" CssClass="twitterStyleTextbox"

        placeholder="Your Message" TextMode="MultiLine" Width="249px"/><br />
<asp:RequiredFieldValidator ID="RV4" runat="server"

                            ControlToValidate="txtMessage" ForeColor=Red

                            ErrorMessage="Please write your feedback"

                            SetFocusOnError="True">
</asp:RequiredFieldValidator><br />
</div>

<div>
<asp:Button  ID="btnSubmit" runat="server"

            Text="Submit" onclick="btnSubmit_Click"/>
</div>
<asp:ValidationSummary ID="ValidationSummary1"

                       runat="server"/>
</fieldset>
<asp:Label ID="Label1" runat="server" Text=""/>
</div>

我的c＃代码

my c# code

private void sendmail()
   {
       try
       {

           str_mailer.Append(@"<b>Name : </b>  " + txtName.Text);
           str_mailer.Append(@"<br/> <b>Email Address : </b>" + txtMail.Text);
           str_mailer.Append(@"<br/><b>Subject : </b>" + txtSubject.Text);
           str_mailer.Append(@"<br/><b>Message : </b>" + txtMessage.Text);
           System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage(ConfigurationManager.AppSettings["id"], ConfigurationManager.AppSettings["to"], "Contact Us", str_mailer.ToString());
           System.Net.NetworkCredential mailAuthentication = new System.Net.NetworkCredential(ConfigurationManager.AppSettings["id"], ConfigurationManager.AppSettings["pswd"]);
           System.Net.Mail.SmtpClient mailClient = new System.Net.Mail.SmtpClient(ConfigurationManager.AppSettings["smtp"], Convert.ToInt32(ConfigurationManager.AppSettings["port"]));
           mailClient.EnableSsl = true;
           mail.IsBodyHtml = true;
           mailClient.UseDefaultCredentials = false;
           mailClient.Credentials = mailAuthentication;
           mailClient.Send(mail);
           Label1.Text = "<b>Thank you for contacting with us. We will be in contact with you soon.<b>";
       }
       catch
       {



           Label1.Text = "Please wait..";
           sendmail();


       }

   }

   protected void btnSubmit_Click(object sender, EventArgs e)
   {
       sendmail();
       txtMail.Text = "";
       txtMessage.Text = "";
       txtSubject.Text = "";
       txtName.Text = "";
   }

web.config code

web.config code

<appSettings>
  <add key="to" value="to address"/>
  <add key="from" value="mygmail@gmail.com "/>
  <add key="id" value="mygmail@gmail.com   "/>
  <add key="pswd" value="password"/>
  <add key="port" value="587"/>
  <add key="smtp" value="smtp.gmail.com"/>
</appSettings>

plz help someone to me.

plz help someone to me.