...open the standard email client?

uses Registry;

procedure OpenMailClient;
const
  cMailClient = '\SOFTWARE\Clients\Mail\';
var
  reg: TRegistry;
  RegClientDefault: string;
begin
  reg := TRegistry.Create;
  try
    with reg do
    begin
      CloseKey;
      RootKey := HKEY_LOCAL_MACHINE;
      if OpenKeyReadOnly(cMailClient) then  RegClientDefault := reg.ReadString('');
      if OpenKeyReadOnly(cMailClient + RegClientDefault + '\shell\open\command') then
        WinExec(PChar(ReadString('')), SW_SHOWNORMAL);
    end;
  finally
    reg.Free;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  OpenMailClient;
end;

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