Read IMAP Email Headers

Call FetchHeaders to download only the email headers.

Download Chilkat IMAP ActiveX

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
imap: TChilkatImap;
success: Integer;
messageSet: CHILKATIMAPLib_TLB.IMessageSet;
fetchUids: Integer;
bundle: CHILKATIMAPLib_TLB.IChilkatEmailBundle2;
i: Integer;
email: CHILKATIMAPLib_TLB.IChilkatEmail2;
j: Integer;
name: String;
addr: String;
numAttach: Integer;
attachSize: Integer;

begin
imap := TChilkatImap.Create(Self);

//  Anything unlocks the component and begins a fully-functional 30-day trial.
success := imap.UnlockComponent('Anything for 30-day trial');
if (success <> 1) then
  begin
    ShowMessage(imap.LastErrorText);
    Exit;
  end;

//  Connect to an IMAP server.
success := imap.Connect('mail.chilkatsoft.com');
if (success <> 1) then
  begin
    ShowMessage(imap.LastErrorText);
    Exit;
  end;

//  Login
success := imap.Login('****','****');
if (success <> 1) then
  begin
    ShowMessage(imap.LastErrorText);
    Exit;
  end;

//  Select an IMAP mailbox
success := imap.SelectMailbox('Inbox');
if (success <> 1) then
  begin
    ShowMessage(imap.LastErrorText);
    Exit;
  end;

//  We can choose to fetch UIDs or sequence numbers.
fetchUids := 1;
//  Get the message IDs of all the emails in the mailbox
messageSet := imap.Search('ALL',fetchUids);
if (messageSet = nil ) then
  begin
    ShowMessage(imap.LastErrorText);
    Exit;
  end;

//  When downloading headers, each email object contains
//  (obviously) the headers, but the body will be missing.
//  Also, attachments will not be included.  However, it is
//  possible to get information about the attachments
//  as well as the complete size of the email.

bundle := imap.FetchHeaders(messageSet);
if (bundle = nil ) then
  begin

    ShowMessage(imap.LastErrorText);
    Exit;
  end;

//  Loop over the email objects and display information
//  about each:

for i := 0 to bundle.MessageCount - 1 do
  begin

    email := bundle.GetEmail(i) As CHILKATIMAPLib_TLB.IChilkatEmail2;

    //  Display the From and Subject
    Memo1.Lines.Add(email.From);
    Memo1.Lines.Add(email.Subject);

    //  Display the recipients:

    for j := 0 to email.NumTo - 1 do
      begin
        name := email.GetToName(j);
        addr := email.GetToAddr(j);
        Memo1.Lines.Add(name + ', ' + addr);
      end;

    for j := 0 to email.NumCC - 1 do
      begin
        name := email.GetCcName(j);
        addr := email.GetCcAddr(j);
        Memo1.Lines.Add(name + ', ' + addr);
      end;

    //  Show the total size of the email, including body and attachments:
    Memo1.Lines.Add(IntToStr(email.Size));

    //  When a full email is downloaded, we would use the
    //  email.NumAttachments property in conjunction with the
    //  email.GetMailAttach* methods.
    //  However, when an email object contains only the header,
    //  we need to access the attachment info differently:
    numAttach := imap.GetMailNumAttach(email As CHILKATIMAPLib_TLB.IChilkatEmail2);
    for j := 0 to numAttach - 1 do
      begin
        Memo1.Lines.Add(imap.GetMailAttachFilename(email As CHILKATIMAPLib_TLB.IChilkatEmail2,j));
        attachSize := imap.GetMailAttachSize(email As CHILKATIMAPLib_TLB.IChilkatEmail2,j);
        Memo1.Lines.Add('    size = ' + IntToStr(attachSize)
             + ' bytes');
      end;

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

  end;

//  Disconnect from the IMAP server.
imap.Disconnect();


end;