[exim] Problem with spamassassin

Hi all!

I have a problem with spamassassin with exim-4.6x
recently I have upgraded the version from the 4.62 to the 4.63 and I
have always the same problem.
If I check some spam mail I don't found the headers X-Spam-Score e
X-Spam-Report.
I suppose that exim sometime don't send mail to spamassassin.
How can check it? Can I enable some log to debug this function? I need
to recompile to it?

Andrea