This is not new idea, actually. someone at spamassassin plugin developers have been made before. basically, the idea was put email addresses in RBLDNSD zone dnset format, ie:
Email user@example.com RBLDNSD user.example.com
So, we replace @ sign into dot (.) sign. that way, we can save the email addresses into the RBLDNSD dnset zone.
RBLDNSD part:
create emailbl zone, meta information
zone
:127.0.0.4:DNSBL. $ - Not receiving email right now. example.user.gmail.com example.user.rediffmail.com
meta
$NS 1w ns.example.com ns.example.com $SOA 1w ns.example.com admin.example.com 0 2h 2h 1w 1h $DATASET generic @ @ A 1.2.3.4 @ MX 10 mx.example.com @ TXT "example email blocklist"
in /etc/sysconfig/rbldnsd
RBLDNSD="dsbl -r/var/lib/rbldns/dsbl -t 300 -b 1.2.3.4 \ emailbl.example.com:combined:meta,emailbl "
ofcourse we should delegate the subdomain emailbl.example.com in example.com authoritative nameserver
; subdomain delegation emailbl.example.com. IN NS ns.example.com. ns.example.com. IN A 1.2.3.4
start rbldnsd service
service rbldnsd start