SmtpFailedRecipientsException Not working
I need to check if mail was send to existing recipient
Here is my code
try
{
var smtpServer = new SmtpClient("smtp.gmail.com", 587)
{
开发者_运维问答 Credentials = new System.Net.NetworkCredential(MAIL_FROM, PASSWORD),
EnableSsl = true
};
var mail = new MailMessage();
mail.From = MAIL_FROM
mail.To.Add(new MailAddress("nonexisting@gmail.com"));
mail.Subject = title;
mail.Body = content;
smtpServer.Send(mailMessage);
}
catch (SmtpFailedRecipientsException ex)
{
// never occures
}
But SmtpFailedRecipientsException never occures when there is no recipient
Is there a way to configure SmtpServer to fire this exception?
The problem is that GMail doesn't say that the user is invalid during the SMTP transaction. The reason is that spammers used to perform dictionary attacks looking for "bob@gmail.com" and "tom@gmail.com", etc. Any address that didn't get marked as "not there" would then be a valid address. So most SMTP servers now just accept all addresses during the SMTP transaction and either just silently drop the invalid ones or send a bounce message later. In either case there's no way in code to determine this.
in source view
------------------------------------------------------------------------------------------
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Send Mail using asp.net</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table style=" border:1px solid" align="center">
<tr>
<td colspan="2" align="center">
<b>Send Mail using asp.net</b>
</td>
</tr>
<tr>
<td>
From:
</td>
<td>
<asp:TextBox ID="txtFrom" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
Subject:
</td>
<td>
<asp:TextBox ID="txtSubject" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
To:
</td>
<td>
<asp:TextBox ID="txtTo" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td valign="top">
Body:
</td>
<td>
<asp:TextBox ID="txtBody" runat="server" TextMode="MultiLine" Columns="30" Rows="10" ></asp:TextBox>
</td>
</tr>
<tr>
<td>
</td>
<td>
<asp:Button ID="btnSubmit" Text="Send" runat="server" onclick="btnSubmit_Click" />
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
---------------------------------------------------------------------------------------In codeview
------------
namespace using system.net;
btnSubmit_click(object sender,eventargs e)
{
MailMessage Msg = new MailMessage();
// Sender e-mail address.
Msg.From = txtFrom.Text;
// Recipient e-mail address.
Msg.To = txtTo.Text;
Msg.Subject = txtSubject.Text;
Msg.Body = txtBody.Text;
// your remote SMTP server IP.
SmtpMail.SmtpServer = "10.20.72.1";
SmtpMail.Send(Msg);
Msg = null;
Page.RegisterStartupScript("UserMsg", "<script>alert('Mail sent thank you...');if(alert){ window.location='SendMail.aspx';}</script>");
}
catch (Exception ex)
{
Console.WriteLine("{0} Exception caught.", ex);
}
加载中,请稍侯......
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