[otrs] How to encrypt with PGP for multiple recipients

Hello, I get the following message when I try to send to multiple recipients : * Just one recipient for crypt possible! Actually, the user interface does not seem to support multiple recipients for encryption, is it right ? The field "Crypt" in the Compose Answer interface displays only a combo box for choosing the encryption PGP key. Is it possible to configure PGP module to encrypt to multiple recipients ? Thanks in advance Olivier