[Mimedefang] and statement for probable spam Not working ??

[troy lebouef]

I dont understand why this is not working ... 
 
When I put this entry in mimedefang compiles but data input to the log 
for probable spam goes to zero.
 
     if ($hits <= $req and $hits >= 0) {
                md_log('probable_spam', $hits, $RelayAddr);
                }

It only works like this : 
    
    if ($hits <= $req ) {
                md_log('probable_spam', $hits, $RelayAddr);
                }

Any ideas ??