lmtpd rejecting messages

[Alex Cresswell]

So I posted earlier with Service unavailable messages coming back from 
lmtpd, this is the bounce message I'm seeing.  Is there any way to 
override lmtpd so that it will accept these messages or fix to filter 
these characters out?

... while talking to localhost:
>>> DATA
<<< 554 5.6.0 Message contains NUL characters
554 5.0.0 Service unavailable
-Alex