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procedure TForm1.Button1Click(Sender: TObject);
var mailcount: integer;
var j: integer;
var file123: tfilename;
begin
idpop31.Host:='pop.mail.de';
idpop31.Username:='mustermann@provider.de';
idpop31.Password:='xyzpasswort';
idpop31.Connect();
mailcount:=idpop31.CheckMessages;
for j:=1 to mailcount do
begin
idmessage1.clear;
IdPop31.Retrieve(j,IdMessage1);
label9.Caption:=inttostr(j)+' Emails von '+inttostr(mailcount)+' empfangen';
if idMessage1.MessageParts.Items[j-1] is TIDAttachment then
begin
file123:=(idMessage1.MessageParts.Items[j-1] as TIDAttachment).Filename;
(idMessage1.MessageParts.Items[j-1] as TIDAttachment).SaveToFile('c:\' +file123);
end;
end;
idpop31.Disconnect;
end;
end.					

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procedure TForm1.Button1Click(Sender: TObject);
var
  mailcount: integer;
  j, i: integer;
  filename: string;
begin
  idpop31.Host:='pop.mail.de';
  idpop31.Username:='mustermann@provider.de';
  idpop31.Password:='xyzpasswort';
  idpop31.Connect();

  mailcount:=idpop31.CheckMessages;
  for j:=1 to mailcount do
  begin

    idmessage1.clear;
    IdPop31.Retrieve(j,IdMessage1);
    label9.Caption:=inttostr(j)+' Emails von '+inttostr(mailcount)+' empfangen';

    for i := 0 to idMessage1.MessageParts.Count - 1 do // <SCHLEIFE ÜBER MESSAGEPARTS>
    begin

      if idMessage1.MessageParts.Items[i] is TIDAttachment then
      begin
        filename := (idMessage1.MessageParts.Items[i] as TIDAttachment).Filename;
        (idMessage1.MessageParts.Items[i] as TIDAttachment).SaveToFile('c:\' + filename);
      end;

    end;

  end;

idpop31.Disconnect;
end;