Windows 양식 응용 프로그램에서 전자 메일 보내기

Question

원격/격리 된 컴퓨터에서 실행되는 Windows 양식 응용 프로그램을 만들고 관리자에게 전자 메일로 오류 알림을 보냅니다. 나는 이것을 달성하기 위해 System.Net.Mail 클래스를 사용하려고했지만 나는 이상한 문제로 실행 해요 :

System.IO.IOException: Unable to read data from the transport connection: 
An existing connection was forcibly closed by the remote host.---> 
System.Net.Sockets.SocketException: An existing connection was forcibly closed by 
the remote host at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, 
Int32 size, SocketFlags socketFlags) at System.Net.Sockets.NetworkStream. 
Read(Byte[] buffer, Int32 offset, Int32 size) 

2 내가 네트워크 스니핑 시도 :

1 내가 오류 메시지가 활동이 잘못되었는지 확인하십시오. 이 시점에서

i) The DNS lookup for my SMTP server's hostname works 
ii) My application connects to the SMTP server and sends "EHLO MY-HOSTNAME" 
iii) SMTP server responds back with it's usual 
iv) My application sends "AUTH login abcdxyz" and receives an acknowledgement packet 

SMTP 서버가 암호를 요구하지 않는 것 중 하나 보인다 또는 내 컴퓨터를 요청할 수있는 SMTP 서버 전에 SMTP 서버로의 연결을 차단 : 그래서 여기가는 방법 암호.

다른 SMTP 포트와 SMTP 호스트를 사용해 보았습니다. 또한 방화벽과 AV를 사용하지 못하게했지만 운이 없었습니다. PuTTY를 사용하여 SMTP 서버에 연결하고 내 응용 프로그램과 동일한 명령 시퀀스를 실행하는 동안 (패킷 스니퍼에서 가져옴) 모든 것이 정상적으로 작동하고 전자 메일을 보낼 수 있습니다.

Imports System.Net 
Imports System.Net.Mail 

Public Function SendMail() As Boolean 

    Dim smtpClient As New SmtpClient("smtp.myserver.com", 587) 'I tried using different hosts and ports 
    smtpClient.UseDefaultCredentials = False 
    smtpClient.Credentials = New NetworkCredential("username@domain.com", "password") 
    smtpClient.EnableSsl = True 'Also tried setting this to false 

    Dim mm As New MailMessage 
    mm.From = New MailAddress("username@domain.com") 
    mm.Subject = "Test Mail" 
    mm.IsBodyHtml = True 
    mm.Body = "<h1>This is a test email</h1>" 
    mm.To.Add("someone@domain.com") 

    Try 
      smtpClient.Send(mm) 
      MsgBox("SUCCESS!") 
    Catch ex As Exception 
      MsgBox(ex.InnerException.ToString) 
    End Try 

    mm.Dispose() 
    smtpClient.Dispose() 

    Return True 

End Function 

어떤 조언 :

여기에 내가 사용하고 코드인가?

Answer 1

는 다음과 같이 작동 :

public SmtpClient client = new SmtpClient(); 
    public MailMessage msg = new MailMessage(); 
    public System.Net.NetworkCredential smtpCreds = new System.Net.NetworkCredential("mail", "password"); 

    public void Send(string sendTo, string sendFrom, string subject, string body) 
    { 
     try 
     { 
      //setup SMTP Host Here 
      client.Host = "smtp.gmail.com"; 
      client.Port = 587; 
      client.UseDefaultCredentials = false; 
      client.Credentials = smtpCreds; 
      client.EnableSsl = true; 

      //converte string to MailAdress 

      MailAddress to = new MailAddress(sendTo); 
      MailAddress from = new MailAddress(sendFrom); 

      //set up message settings 

      msg.Subject = subject; 
      msg.Body = body; 
      msg.From = from; 
      msg.To.Add(to); 

      // Enviar E-mail 

      client.Send(msg); 

     } 
     catch (Exception error) 
     { 
      MessageBox.Show("Unexpected Error: " + error); 
     } 
    } 

전화하는 것을 잊지 말아

이

public partial class MainWindow : Window 
{ 
    public MainWindow() 
    { 
     InitializeComponent(); 
    } 

    private void btnTest_Click(object sender, RoutedEventArgs e) 
    { 
     MailAddress from = new MailAddress("Someone@domain.topleveldomain", "Name and stuff"); 
     MailAddress to = new MailAddress("Someone@domain.topleveldomain", "Name and stuff"); 
     List<MailAddress> cc = new List<MailAddress>(); 
     cc.Add(new MailAddress("Someone@domain.topleveldomain", "Name and stuff")); 
     SendEmail("Want to test this damn thing", from, to, cc); 
    } 

    protected void SendEmail(string _subject, MailAddress _from, MailAddress _to, List<MailAddress> _cc, List<MailAddress> _bcc = null) 
    { 
     string Text = ""; 
     SmtpClient mailClient = new SmtpClient("Mailhost"); 
     MailMessage msgMail; 
     Text = "Stuff"; 
     msgMail = new MailMessage(); 
     msgMail.From = _from; 
     msgMail.To.Add(_to); 
     foreach (MailAddress addr in _cc) 
     { 
      msgMail.CC.Add(addr); 
     } 
     if (_bcc != null) 
     { 
      foreach (MailAddress addr in _bcc) 
      { 
       msgMail.Bcc.Add(addr); 
      } 
     } 
     msgMail.Subject = _subject; 
     msgMail.Body = Text; 
     msgMail.IsBodyHtml = true; 
     mailClient.Send(msgMail); 
     msgMail.Dispose(); 
    } 
} 

가 using System.Net.Mail;

잊지 마세요

I 얇음 그것은 여기에 다음과 같이 작동 코드입니다 VB에서 k는, 내가 자주 vb.net에 기록하지 않는, 약간의 오차가있을 수 있습니다 :

Private Sub btnTest_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) 
    Dim _from As New MailAddress("Someone@domain.topleveldomain", "Name and stuff") 
    Dim _to As New MailAddress("Someone@domain.topleveldomain", "Name and stuff") 
    Dim cc As New List(Of MailAddress) 
    cc.Add(New MailAddress("Someone@domain.topleveldomain", "Name and stuff")) 
    SendEmail("Wan't to test this fucking thing", _from, _to, cc) 
End Sub 

Protected Sub SendEmail(ByVal _subject As String, ByVal _from As MailAddress, ByVal _to As MailAddress, ByVal _cc As List(Of MailAddress), Optional ByVal _bcc As List(Of MailAddress) = Nothing) 

    Dim Text As String = "" 
    Dim mailClient As New SmtpClient("Mailhost") 
    Dim msgMail As MailMessage 
    Text = "Stuff" 
    msgMail = New MailMessage() 
    msgMail.From = _from 
    msgMail.To.Add(_to) 
    For Each addr As MailAddress In _cc 
     msgMail.CC.Add(addr) 
    Next 
    If _bcc IsNot Nothing Then 
     For Each addr As MailAddress In _bcc 
      msgMail.Bcc.Add(addr) 
     Next 
    End If 
    msgMail.Subject = _subject 
    msgMail.Body = Text 
    msgMail.IsBodyHtml = True 
    mailClient.Send(msgMail) 
    msgMail.Dispose() 
End Sub 

이

가져 잊지 마세요 System.Net.Mail

Answer 2

시도는이를 사용 : C#에서

using System.Net.Mail; 
using System.Windows.Forms; 

Answer 3

SendMail.CS Page 

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 
using System.Net; 
using System.Net.Mail; 

namespace SendMailUsingWindowsForms 
{ 
    public partial class Form1 : Form 
    { 
     public Form1() 
     { 
      InitializeComponent(); 
     } 

     private void button1_Click(object sender, EventArgs e) 
     { 
      try 
      { 

       //Sending the email. 
       //Now we must create a new Smtp client to send our email. 

       SmtpClient client = new SmtpClient("smtp.gmail.com", 25); //smtp.gmail.com // For Gmail 
                      //smtp.live.com // Windows live/Hotmail 
                      //smtp.mail.yahoo.com // Yahoo 
                      //smtp.aim.com // AIM 
                      //my.inbox.com // Inbox 


       //Authentication. 
       //This is where the valid email account comes into play. You must have a valid email account(with password) to give our program a place to send the mail from. 

       NetworkCredential cred = new NetworkCredential("*******@gmail.com", "........"); 

       //To send an email we must first create a new mailMessage(an email) to send. 
       MailMessage Msg = new MailMessage(); 

       // Sender e-mail address. 
       Msg.From = new MailAddress(textBox1.Text);//Nothing But Above Credentials or your credentials (*******@gmail.com) 

       // Recipient e-mail address. 
       Msg.To.Add(textBox2.Text); 

       // Assign the subject of our message. 
       Msg.Subject = textBox3.Text; 

       // Create the content(body) of our message. 
       Msg.Body = textBox4.Text; 

       // Send our account login details to the client. 
       client.Credentials = cred; 

       //Enabling SSL(Secure Sockets Layer, encyription) is reqiured by most email providers to send mail 
       client.EnableSsl = true; 

       //Confirmation After Click the Button 
       label5.Text = "Mail Sended Succesfully"; 

       // Send our email. 
       client.Send(Msg); 



      } 
      catch 
      { 
       // If Mail Doesnt Send Error Mesage Will Be Displayed 
       label5.Text = "Error"; 
      } 
     } 


    } 
} 

는 SendMail.Design