[exim] strange exim ACL

hi, i run exim 4.52 on a freebsd box. i recently picked up strange logs
about an ACL i never configured or doesnt exist in my configure file. it
looks somewhat like this:

2006-07-24 15:22:06 1G4zRl-000GFW-Oo H=(USERNAME) [xxx.xxx.xxx.xxx] F=<
isaac@xxxxxxxxxxxxxxxxx> temporarily rejected after DATA: failed to expand
ACL string "C U R R E N T _ P R I C E : $ 2 . 3 4 G E T I T N 0 W !": $
not followed by letter, digit, or {


what is amazing is that i have received junk mail with a somewhat close text
as this ACL its trying to expand. this is the line:

The alert is ON!

Get QEGY First Thing Today!
This Is Going To Explode!
Check out for HOT NEWS!


QUANTUM ENERGY INC (QEGY)
CURRENT_PRICE: $2.34 GET IT N0W!

this is the body of the email, why it gets to expand it as an ACL beats
me....any one seen this before.


Mike