Download POP3 Email using UIDLs

Demonstrates how to download POP3 email by first getting the complete set of UIDLs and then downloading email by calling FetchEmail for each UIDL. This is equivalent to calling CopyMail, except your application can process each email as it arrives instead of waiting for the entire bundle to be downloaded. Also, it's better protection against potential out-of-memory issues if your mailbox has a very large number of messages. There is no performance difference between fetching emails individually vs. calling CopyMail.

Download Chilkat Email ActiveX

uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    CHILKATMAILLib2_TLB,
    CHILKATUTILLib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
mailman: TChilkatMailMan2;
success: Integer;
sa: CHILKATUTILLib_TLB.ICkStringArray;
i: Integer;
n: Integer;
email: CHILKATMAILLib2_TLB.IChilkatEmail2;
uidl: String;

begin
//  The mailman object is used for receiving (POP3)
//  and sending (SMTP) email.
mailman := TChilkatMailMan2.Create(Self);

//  Any string argument automatically begins the 30-day trial.
success := mailman.UnlockComponent('30-day trial');
if (success <> 1) then
  begin
    ShowMessage('Component unlock failed');
    Exit;
  end;

//  Set the POP3 server's hostname
mailman.MailHost := 'mail.chilkatsoft.com';

//  Set the POP3 login/password.
mailman.PopUsername := 'myLogin';
mailman.PopPassword := 'myPassword';

sa := mailman.GetUidls() as CHILKATUTILLib_TLB.ICkStringArray;
if (sa = nil ) then
  begin
    Memo1.Lines.Add(mailman.LastErrorText);
    Exit;
  end;

n := sa.Count;

for i := 0 to n - 1 do
  begin

    uidl := sa.GetString(i);

    email := mailman.FetchEmail(uidl) As CHILKATMAILLib2_TLB.IChilkatEmail2;
    if (email = nil ) then
      begin
        Memo1.Lines.Add(mailman.LastErrorText);
        break;
      end;
    Memo1.Lines.Add(email.From);
    Memo1.Lines.Add(email.Subject + #13#10);

  end;

mailman.Pop3EndSession();
end;