(Delphi DLL) POP3 to SMTP Forwarder

Read a POP3 mailbox and forwards the email to another email address, keeping the recipients in the original email the same.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, StringTable, BinData, MailMan;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
mailman: HCkMailMan;
fromAddr: PWideChar;
toAddr: PWideChar;
stUidls: HCkStringTable;
bdMime: HCkBinData;
count: Integer;
i: Integer;
uidl: PWideChar;

begin
success := False;

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

mailman := CkMailMan_Create();

// Set the POP3 server's hostname
CkMailMan_putMailHost(mailman,'pop.example.com');

// Set the POP3 login/password.
CkMailMan_putPopUsername(mailman,'MY_POP3_LOGIN');
CkMailMan_putPopPassword(mailman,'MY_POP3_PASSWORD');

// Set the SMTP hostname for sending.
CkMailMan_putSmtpHost(mailman,'smtp.example.com');
CkMailMan_putSmtpUsername(mailman,'MY_SMTP_LOGIN');
CkMailMan_putSmtpPassword(mailman,'MY_SMTP_PASSWORD');

fromAddr := 'me@example.com';
toAddr := 'recipient@somewhere.com';

// The the UIDLs for all email in the POP3 mailbox.
stUidls := CkStringTable_Create();
success := CkMailMan_FetchUidls(mailman,stUidls);
if (success = False) then
  begin
    Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));
    Exit;
  end;

// Just mark messages for delete, then delete at the end.
CkMailMan_putImmediateDelete(mailman,False);

// Download the email from the server.  Call FetchMimeBd
// because we don't want to load the emails into email objects.
// (We'll delete the emails that are forwarded without error.)
bdMime := CkBinData_Create();

count := CkStringTable_getCount(stUidls);
i := 0;
while i < count do
  begin
    uidl := CkStringTable__stringAt(stUidls,i);
    Memo1.Lines.Add('UIDL: ' + uidl);

    success := CkMailMan_FetchMimeBd(mailman,uidl,bdMime);
    if (success = False) then
      begin
        Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));
        Exit;
      end;

    success := CkMailMan_SendMimeBd(mailman,fromAddr,toAddr,bdMime);
    if (success = False) then
      begin
        Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));
        Exit;
      end;

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

    i := i + 1;
  end;

// Delete messages marked for delete.
CkMailMan_putImmediateDelete(mailman,True);
success := CkMailMan_Pop3EndSession(mailman);
if (success = False) then
  begin
    Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));
    Exit;
  end;

Memo1.Lines.Add('Success.');

CkMailMan_Dispose(mailman);
CkStringTable_Dispose(stUidls);
CkBinData_Dispose(bdMime);

end;