current postfix rbl and some related config

main.cf

# this is part of my /etc/postfix/main.cf file:

smtp_helo_timeout = 60s
smtp_connect_timeout = 60s
smtp_destination_concurrency_limit = 18
smtp_destination_recipient_limit = 24
smtpd_helo_required = yes
smtpd_recipient_limit = 80
smtpd_recipient_overshoot_limit = 120
local_destination_concurrency_limit = 6
body_checks_size_limit = 102400
header_size_limit = 102400
message_size_limit = 36000000
mailbox_size_limit = 0
queue_minfree = 122880000
qmgr_message_active_limit = 12000
bounce_size_limit = 150000
in_flow_delay = 1s

# tempfailed adapted to 3 minutes:
queue_run_delay = 181s
minimal_backoff_time = 181s
maximal_backoff_time = 3601s
maximal_queue_lifetime = 14d

biff = no
smtpd_delay_reject = yes
smtpd_sender_restrictions = permit_mynetworks, reject_non_fqdn_sender, reject_unknown_sender_domain, check_sender_access hash:/etc/postfix/sender_access, permit
smtpd_data_restrictions = reject_multi_recipient_bounce, reject_unauth_pipelining, permit

disable_vrfy_command = yes
strict_rfc821_envelopes = yes
invalid_hostname_reject_code = 554
non_fqdn_reject_code = 554
unknown_address_reject_code = 554
unknown_client_reject_code = 554
unknown_hostname_reject_code = 554
unknown_local_recipient_reject_code = 554
unknown_virtual_alias_reject_code = 554
unknown_virtual_mailbox_reject_code = 554
unverified_recipient_reject_code = 554
unverified_sender_reject_code = 554

maps_rbl_reject_code = 451

# tarpitting stupid spammers
smtpd_error_sleep_time = 20
smtpd_soft_error_limit = 2
smtpd_hard_error_limit = 4
smtpd_junk_command_limit = 2

smtpd_recipient_restrictions =
    reject_non_fqdn_sender,
    reject_non_fqdn_recipient,
    reject_non_fqdn_hostname,
    reject_invalid_hostname,
     permit_mynetworks,
     permit_sasl_authenticated,
    reject_unauth_pipelining,
    reject_unknown_sender_domain,
    reject_unknown_recipient_domain,
    reject_unauth_destination,
    reject_unknown_client,
     check_client_access hash:/etc/postfix/whitelist,
     permit_dnswl_client hostkarma.junkemailfilter.com=127.0.0.1,
     permit_dnswl_client hostkarma.junkemailfilter.com=127.0.0.5,
     permit_dnswl_client list.dnswl.org,
    reject_rbl_client badconf.rhsbl.sorbs.net,
    reject_rbl_client virbl.dnsbl.bit.nl,
    reject_rhsbl_sender uribl.spameatingmonkey.net,
    reject_rhsbl_client uribl.spameatingmonkey.net,
    reject_rbl_client zen.spamhaus.org,
#    reject_rbl_client b.barracudacentral.org,  too many false positives lately..
    reject_rbl_client hostkarma.junkemailfilter.com=127.0.0.2,
    reject_rbl_client truncate.gbudb.net,
    reject_rbl_client all.spam-rbl.fr,
    reject_rbl_client dnsbl.inps.de,
    reject_rbl_client 0spam.fusionzero.com,
     permit