(Delphi ActiveX) Read IMAP Email Headers

Call FetchHeaders to download only the email headers.

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

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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
imap: TChilkatImap;
fetchUids: Integer;
messageSet: TMessageSet;
bundle: TChilkatEmailBundle;
headersOnly: Integer;
email: TChilkatEmail;
name: WideString;
addr: WideString;
i: Integer;
j: Integer;
numAttach: Integer;
attachSize: Integer;

begin
success := 0;

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

imap := TChilkatImap.Create(Self);

// Connect to an IMAP server.
// Use TLS
imap.Ssl := 1;
imap.Port := 993;
success := imap.Connect('imap.example.com');
if (success = 0) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

// Login
success := imap.Login('****','****');
if (success = 0) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

// Select an IMAP mailbox
success := imap.SelectMailbox('Inbox');
if (success = 0) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

// Get the message IDs of all the emails in the mailbox
// We can choose to fetch UIDs or sequence numbers.
fetchUids := 1;
messageSet := TMessageSet.Create(Self);
success := imap.QueryMbx('ALL',fetchUids,messageSet.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(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 := TChilkatEmailBundle.Create(Self);
headersOnly := 1;
success := imap.FetchMsgSet(headersOnly,messageSet.ControlInterface,bundle.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

// Loop over the email objects and display information
// about each:
email := TChilkatEmail.Create(Self);

i := 0;
j := 0;
while i < bundle.MessageCount do
  begin
    bundle.EmailAt(i,email.ControlInterface);

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

    // Display the recipients:
    j := 0;
    while j < email.NumTo do
      begin
        Memo1.Lines.Add('TO: ' + email.GetToName(j) + ', ' + email.GetToAddr(j));
        j := j + 1;
      end;

    j := 0;
    while j < email.NumCC do
      begin
        Memo1.Lines.Add('CC: ' + email.GetCcName(j) + ', ' + email.GetCcAddr(j));
        j := j + 1;
      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.ControlInterface);
    j := 0;
    while j < numAttach do
      begin
        Memo1.Lines.Add(imap.GetMailAttachFilename(email.ControlInterface,j));
        attachSize := imap.GetMailAttachSize(email.ControlInterface,j);
        Memo1.Lines.Add('    size = ' + IntToStr(attachSize) + ' bytes');
        j := j + 1;
      end;

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

// Disconnect from the IMAP server.
success := imap.Disconnect();
end;