C＃發送郵件失敗

我已經創建了一個應用程序，因爲我已經給出了發送郵件的選項。它一直工作到昨天。但是，今天我收到了一個錯誤，發送郵件如「發送郵件失敗。」。爲此，我已在下面給出了我的代碼，請幫我解決它。C＃發送郵件失敗

protected void Button1_Click(object sender, EventArgs e) 
    { 
     try 
     { 
      if (TextBox1.Text == "") 
      { 

       string alertmessage = ""; 
       alertmessage = "Email ID. cannot be blank "; 
       this.CreateMessageAlert(this, alertmessage, "alertKey"); 
       TextBox1.Focus(); 
      } 
      else if (TextBox2.Text == "") 
      { 

       string alertmessage = ""; 
       alertmessage = "CC To cannot be blank "; 
       this.CreateMessageAlert(this, alertmessage, "alertKey"); 
       TextBox2.Focus(); 
      } 
      else if (TextBox3.Text == "") 
      { 

       string alertmessage = ""; 
       alertmessage = "Subject cannot be blank "; 
       this.CreateMessageAlert(this, alertmessage, "alertKey"); 
       TextBox3.Focus(); 
      } 
      else if (TextBox4.Text == "") 
      { 

       string alertmessage = ""; 
       alertmessage = "Message Body cannot be blank "; 
       this.CreateMessageAlert(this, alertmessage, "alertKey"); 
       TextBox4.Focus(); 
      } 
      //else if (upSignature.FileName == "") 
      //{ 
      // ctr = 1; 
      // string alertmessage = ""; 
      // alertmessage = "Attachment Missing..."; 
      // this.CreateMessageAlert(this, alertmessage, "alertKey"); 
      // upSignature.Focus(); 
      //} 

      else 
      { 


       string photo = "Enquiry" + Session["MRNO"].ToString() + FileUpload1.FileName; 
       string strpath = Request.MapPath("~/"); 
       FileUpload1.SaveAs(strpath + "/Enquiry/" + photo); 


       try 
       { 
        MailMessage mail = new MailMessage(); 
        mail.To.Add(new MailAddress(TextBox1.Text.Trim())); 
        mail.From = new MailAddress("[email protected]"); 
        mail.Subject = "Enquiry for MRNO " + " " + " " + Session["MRNO"].ToString() + " " + " " + "Reg."; 
        mail.CC.Add(TextBox2.Text.Trim()); 
        mail.Body = TextBox4.Text.Trim(); 

        mail.Attachments.Add(new Attachment(FileUpload1.PostedFile.InputStream, FileUpload1.FileName)); 
        mail.Attachments.Add(new Attachment(FileUpload2.PostedFile.InputStream, FileUpload2.FileName)); 
        //Attachment attach = new Attachment(strpath + "/Enquiry/" + photo); 
        //mail.Attachments.Add(attach); 


        SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587); 

        smtp.EnableSsl = true; 

        smtp.UseDefaultCredentials = false; 
        smtp.Credentials = new NetworkCredential("[email protected]", "xxxxx"); 
        //smtp.Credentials = new NetworkCredential("purchaseoeg", "xxxxx"); 
        smtp.Send(mail); 

        string alertmessage = ""; 
        alertmessage = "Mail Has Been Sent"; 
        this.CreateMessageAlert(this, alertmessage, "alertKey"); 


        // Page.RegisterStartupScript("close", "<script language=javascript>self.close();</script>"); 

       } 
       catch (Exception ex) 
       { 
        Response.Write(ex.Message); 
       } 
      } 
     } 
     catch (Exception ex1) 
     { 
      Response.Write(ex1.Message); 
     } 

    }

來源

2012-08-13 user1418723

提供您掛在嘴邊的一句話的的InnerException，並且如果這些是你的實際憑據，請更改他們。 – Dominik 2012-08-13 11:08:09

準確地在哪條線上出現錯誤？當您在此處發佈您的代碼時，包含您的密碼也不是一個好主意。 – 2012-08-13 11:08:15

如果這是您示例代碼中的真實密碼，那麼您可能需要編輯該代碼... – drch 2012-08-13 11:08:21

如果它曾經工作過，現在它不是它可能是SMTP服務器。

<system.net> 
    <mailSettings> 
    <smtp deliveryMethod="SpecifiedPickupDirectory"> 
     <specifiedPickupDirectory pickupDirectoryLocation="C:\TestMailMessages\" /> 
    </smtp> 
    </mailSettings> 
</system.net>

將上面的代碼放在你的App.config或Web.config中。當你發送一條消息時（通過var smtpClient = new SmtpClient（）;）它現在將作爲一個文件存儲在「pickupDirectoryLocation」的目錄中。

如果郵件到達還有OK，然後你的代碼是罰款

那麼你可能會轉移到測試您的SMTP設置/測試服務器。有很多方法可以做到這一點，包括使用Telnet。

如果問題是間歇性的，可能會向SMTP發送添加重試邏輯。

來源

2012-08-13 11:47:19

不在工作的朋友 – user1418723 2012-08-13 12:12:46

開始發送此錯誤「不能爲拾取目錄啓用SSL」 – user1418723 2012-08-13 12:17:21

公共字符串btnSendmail（）{

 try 
     { 
     //Code for send Email 
     string msg = txtEmail.Text; 
     MailMessage sendMailforSA = new MailMessage(); 
     SmtpClient smtpforSA = new SmtpClient(); 
     string subjectforSA = null; 
     subjectforSA = "Thanks for apply"; 
     System.Net.NetworkCredential credforSA = new System.Net.NetworkCredential("[email protected]", "password"); 
     sendMailforSA.To.Add("ToEmailID"); 


     sendMailforSA.From = new MailAddress("[email protected]"); 
     sendMailforSA.Subject = subjectforSA.ToString(); 
     sendMailforSA.Body = "hiii This is Test Message"; 
     sendMailforSA.IsBodyHtml = false; 
     smtpforSA.Host = "smtp.gmail.com"; 
     smtpforSA.Port = 587; 
     smtpforSA.EnableSsl = true; 
     smtpforSA.UseDefaultCredentials = false; 
     smtpforSA.Credentials = credforSA; 
     smtpforSA.Send(sendMailforSA); 
     return "Email successfully sent."; 
     } 
     catch (Exception ex) 
     { 
      return "Send Email Failed." + ex.Message; 
     } 
    }

在web.config文件中還寫

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

     </smtp> 

    </mailSettings> 
    </system.net>

來源

2012-08-13 12:10:58

C＃發送郵件失敗

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