[Dbmail] dbmail 2.0.3 mailbox full message not sent

[Paolo Prandini]

Hi all, I recently switched from 1.2 to 2.0.3, I am using
dbmail-lmtpd for message delivery from postfix.
Now I have the problem that when an user mailbox is full,
the sender doesn't get a mailbox full reply, but a strange
message with 
said: 511
    Recipient <[EMAIL PROTECTED]> (null) Address Status Bad
    destination mailbox address (in reply to end of DATA command)
HELP!
Thanks to everyone.
Paolo