forcing procmail use MBX format

Hello,

could somebody tell me how can I make procmail deliver
mails to my INBOX, which is in MBX format ?

As a delivery agent I use tmail, but I know that
procmail itself can be used as a delivery agent.

Thanks in advance for reply,
Robert Zelazo

 -----------------------------
| Robert Zelazo               |
| CERN - IT Division 31 1-016 |
| CH-1211 Geneve 23           |
| Email: Robert(_dot_)Zelazo(_at_)cern(_dot_)ch|
 -----------------------------