DNSBLs not working?

[jhghjgh hjghgkh]

I've added some DNSBLs to qmail via /etc/xinet.d/smtp_psa and smtps_psa:

service smtp
{
socket_type = stream
protocol = tcp
wait = no
disable = no
user = root
instances = UNLIMITED
server = /var/qmail/bin/tcp-env
server_args = /usr/sbin/rblsmtpd -r xbl.spamhaus.org -r http.dnsbl.sorbs.net -r multi.surbl.org -r bl.spamcop.net -r sbl.spamhaus.org /var/qmail/bin/relaylock /var/qmail/bin/qmail-smtpd /var/qmail/bin/smtp_auth /var/qmail/bin/true /var/qmail/bin/cmd5checkpw /var/qmail/bin/true
}

(smtp_psa and smtps_psa are identical, other than the 'service smtp' line at the top).

I've restarted xinetd, but I'm not sure if they're working: when I look at spamassassin scan results in /usr/local/psa/var/log/maillog, I can see the RCV_IN_BL_SPAMCOP rule (and others) firing on a regular basis ... bit confused how this can be, unless the DNSBLs aren't working at the SMTP level