Delphi DLL Requires Chilkat v11.0.0+

POP3 SSH Tunneling (Port Forwarding)

Demonstrates how to connect to a POP3 server through an SSH tunnel. Reads a POP3 mailbox and display the FROM and SUBJECT header fields of each email. Delphi DLL

var
success: Boolean;
mailman: HCkMailMan;
sshHostname: PWideChar;
sshPort: Integer;
numToDownload: Integer;
i: Integer;
email: HCkEmail;

begin
success := False;

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  The mailman object is used for receiving (POP3) 
//  and sending (SMTP) email.
mailman := CkMailMan_Create();

//  The SSH hostname may be a hostname or an 
//  IP address, such as "192.168.1.108".
//  The port is typically 22 (the standard port for SSH).
sshHostname := 'sftp.example.com';
sshPort := 22;

//  Connect to an SSH server and establish the SSH tunnel:
success := CkMailMan_SshOpenTunnel(mailman,sshHostname,sshPort);
if (success = False) then
  begin
    Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));
    Exit;
  end;

//  Authenticate with the SSH server via a login/password
//  or with a public key.
//  This example demonstrates SSH password authentication.
//  Note: This is not authenticating with the POP3 server, it is
//  for authenticating with the SSH server, which is separate.
success := CkMailMan_SshAuthenticatePw(mailman,'ssh_login','ssh_password');
if (success = False) then
  begin
    Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));
    Exit;
  end;

//  OK, the SSH tunnel is setup.  The mailman may
//  be used exactly the same as usual, except all communications
//  are now sent through the SSH tunnel.

//  The SSH tunnel may be kept open for any number of 
//  POP3 connections.  

//  Set the POP3 server's hostname
CkMailMan_putMailHost(mailman,'mail.my-pop3-server.com');

//  Set the POP3 settings for your POP3 server:
CkMailMan_putPopUsername(mailman,'pop3_login');
CkMailMan_putPopPassword(mailman,'pop3_password');
CkMailMan_putMailPort(mailman,995);
CkMailMan_putPopSsl(mailman,True);

//  Connect to the POP3 server through the already-established SSH tunnel:
success := CkMailMan_Pop3BeginSession(mailman);
if (success = False) then
  begin
    Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));
    Exit;
  end;

//  A visual inspection of the LastErrorText after
//  a successful POP3 connection will confirm the SSH tunneling.
//  Note: If the POP3 connection uses SSL/TLS, then the SSL/TLS 
//  secure channel will be wrapped within the SSH tunnel.
Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));

//  How many messages are in the POP3 inbox?
numToDownload := CkMailMan_GetMailboxCount(mailman);
if (numToDownload > 5) then
  begin
    numToDownload := 5;
  end;
if (numToDownload = 0) then
  begin
    Memo1.Lines.Add('No messages in the POP3 inbox.');
    Exit;
  end;

//  Download a max of 5 messages

email := CkEmail_Create();
for i := 1 to numToDownload do
  begin
    success := CkMailMan_FetchOne(mailman,False,0,i,email);
    if (success = False) then
      begin
        Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));
        Exit;
      end;

    Memo1.Lines.Add(CkEmail__from(email));
    Memo1.Lines.Add(CkEmail__subject(email));
    Memo1.Lines.Add('----');
  end;

//  Close the connection with the POP3 server, leaving the SSH tunnel open for subsequent POP3 connections.
success := CkMailMan_Pop3EndSession(mailman);
if (success = False) then
  begin
    Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));
    Exit;
  end;

//  Try connecting to a different POP3 server through the same aleady setup SSH tunnel:
//  Set the POP3 server's hostname
CkMailMan_putMailHost(mailman,'mail.my-pop3-server2.com');

//  Set the POP3 settings for your POP3 server:
CkMailMan_putPopUsername(mailman,'pop3_login2');
CkMailMan_putPopPassword(mailman,'pop3_password2');
CkMailMan_putMailPort(mailman,110);
CkMailMan_putPopSsl(mailman,False);

success := CkMailMan_Pop3BeginSession(mailman);
if (success = False) then
  begin
    Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));
    Exit;
  end;

//  Review the LastErrorText to see that the connection was made via the SSH tunnel:
Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));

success := CkMailMan_Pop3EndSession(mailman);
if (success = False) then
  begin
    Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));
    Exit;
  end;

//  Close the SSH tunnel.
success := CkMailMan_SshCloseTunnel(mailman);
if (success = False) then
  begin
    Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));
    Exit;
  end;

CkMailMan_Dispose(mailman);
CkEmail_Dispose(email);