有关发送邮件的错误
程序出现错误,望高手解答
程序如下:
<%@ Page Language= "C# " %>
<%@ Import Namespace= "System " %>
<%@ Import Namespace= "System.Net.Mail "%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN " "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<script runat= "server ">
protected void Button1_Click(object sender, EventArgs e)
{
System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();
msg.From = new MailAddress(TextBox4.Text);
msg.To.Add(new MailAddress(TextBox1.Text));
int index1 = TextBox4.Text.LastIndexOf( "@ ");
string str = TextBox4.Text.Substring(index1);
string str1 = TextBox4.Text.Substring(0, index1 + 1);
msg.Subject = TextBox2.Text;
msg.Body = TextBox3.Text;
string attachFile;
attachFile=FileUpload1.FileName;
System.Net.Mail.Attachment mailadd = new Attachment(FileUpload1.PostedFile.InputStream, attachFile);
msg.Attachments.Add(mailadd);
SmtpClient smt = new SmtpClient();
smt.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
string smtpserver = "smtp. " + str;
smt.Host = smtpserver;
smt.Credentials = new System.Net.NetworkCredential(str1, TextBox5.Text.ToString());
smt.Send(msg);
Response.Write( "发送成功 ");
}
</script>
<html xmlns= "http://www.w3.org/1999/xhtml " >
<head id= "Head1 " runat= "server ">
<t