Can postfix reject message with NUL character in body

Hi!

I'm currently using postfix 2.2.3 and cyrus-imapd 2.2.8-6.3 and everything is working perfectly.
Thanks :-)

My current problem is that mailq is reporting hundreds of deferred MAILER-DAEMON "Undelivered Mail
Returned to Sender" which get rejected by my cyrus-imapd server due to the presence of NUL character
in the message body.

Diagnostic-Code: X-Postfix; host xxx [xxx.xxx.xxx.xxx] said: 554 5.6.0
Message contains NUL characters (in reply to end of DATA command)

Is there some patch (or a new feature/option in the some next version) that can be applied to
postfix to directly reject message containing NUL character.

Thanks and have a nice day ?
Eddy