dbpath = /etc/postfix/private/mail.sqlite
query = SELECT ALL bsTarget FROM BScat WHERE lower(bsSender) IS '%s'
	ORDER BY bsPriority

# This query is self-contained in the BScat table. If the sender address
# matches one of the three suspicious characters, a restriction class is
# returned which will cause the client IP address to be looked up
# against backscatterer DNSBLs.