[Exim] SQL Error...

I keep getting this error:

2000-03-07 20:12:11 lookup of "mydomain.com" in "mysql;SELECT DISTINCT
domain FROM domains WHERE domain='$key'" failed to complete


... With this config :

MYSQL_DOMAIN = SELECT DISTINCT MYSQL_DOMAINFIELD FROM MYSQL_DOMAIN_LOOKUP
WHERE MYSQL_DOMAINFIELD='$key'

local_domains = LOCAL_DOMAINS:mysql;MYSQL_DOMAIN

... on my FreeBSD box running the latest MySQL and Exim (as of this
morning).. Since the query (cut and pasted into a mysql query program)
worked fine, I'm curious as to what else may be the problem.. Any ideas?

Thanks!!!