邮件没有被发送使用smtp客户端和ASP.NET

我一直在经历堆栈溢出看起来类似于我的一些帖子，我已经调整了我的代码，但它仍然无法正常工作。我的代码准备好参加以下考试：邮件没有被发送使用smtp客户端和ASP.NET

Dim ss As SmtpClient = New SmtpClient("smtp.gmail.com", 587) 
    'Dim ss As SmtpClient = New SmtpClient("smtp.gmail.com",465) 
    'Dim ss As SmtpClient = New SmtpClient("smtp.gmail.com", 25) 
    ss.Timeout = 10000 
    ss.DeliveryMethod = SmtpDeliveryMethod.Network 
    ss.UseDefaultCredentials = False 
    ss.EnableSsl = True 
    ss.UseDefaultCredentials = False 
    ss.Credentials = New NetworkCredential("[email protected]", "[email protected]") 


    Dim subject As String = "Approval request for Quotation with Order Number: " + Me.OrderNo 

    Dim body As String = "Dear Sir/Madam," + vbCrLf + " This is to bring to your notice the quotation for the Client " + Me.cmbCustomer.SelectedItem.Text + " and Order Number " + Me.OrderNo & _ 
     " which is awaiting your approval." + vbCrLf + "Click here to view and approve the Quotation: http:192.168.20.7/appname/Sales/ManageInvoices.aspx" + vbCrLf & _ 
     " Kindly revert after approval. Thank you." + vbCrLf + "Regards." 

    Dim To1, To2, To3 As String 

    Dim mm As MailMessage = New MailMessage() 
    mm.From = New MailAddress("[email protected]") 

    To1 = "[email protected]" 
    To2 = "[email protected]" 
    To3 = "[email protected]" 
    'To is a collection of MailAddress types 
    mm.To.Add(To1) 
    mm.To.Add(To2) 
    mm.To.Add(To3) 

    mm.Subject = subject 
    mm.Body = body 

    mm.BodyEncoding = UTF8Encoding.UTF8 
    'mm.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure 
    Try 
     ss.Send(mm) 
    Catch ex As SmtpException 
     Me.lblerr.Text = "SMTP Err:" & ex.ToString 
    End Try

那么，如何让邮件不能到达目的地呢？我没有收到任何错误消息。请帮忙谢谢。

来源

2012-11-22 Charles

Gmail，则需要在端口设置为587

<system.net> 
    <mailSettings> 
     <smtp from="[email protected] "> 
     <network host="smtp.gmail.com" defaultCredentials="false" 
      port="587" userName ="[email protected]" password="[email protected]" /> 
     </smtp> 
    </mailSettings> 
    </system.net>

来源

2012-11-22 17:21:04 IrishChieftain

其中他在第一行完成：'新SmtpClient（“smtp.gmail.com”，587）' - 第二个参数是端口号。 –

我试着再次运行，现在出现错误：'无法解析远程名称：'smtp.gmail.com''运行第二次并关闭防火墙后，出现另一个错误：'连接尝试失败因为连接方在一段时间后没有正确响应，或者由于连接的主机未能响应而建立连接失败173.194.67.109：587' – Charles

非常通用的错误消息。可能是代理问题，防火墙问题等。 – IrishChieftain

邮件没有被发送使用smtp客户端和ASP.NET

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