make sure the DNSRBL lists you are targeting are still alive. the test can be done according to the very specific RBL mechanism and using generic listing.
from the MX itself!
for zone in \ bl.spamcop.net \ public.sarbl.org \ cbl.abuseat.org \ psbl.surriel.com \ db.wpbl.info \ b.barracudacentral.org \ bl.blocklist.de \ spam.spamrats.com \ truncate.gbudb.net \ dnsbl.dronebl.org \ zen.spamhaus.org \ ; do echo $zone host 2.0.0.127.$zone && echo OK || echo NOK echo done; unset zone # down ix.dnsbl.manitu.net \ dnsbl.inps.de \
some notes about too restrictive lists
# this sometimes blocks gmail... # dnsbl.dronebl.org # this blocks hh.ru # truncate.gbudb.net # this blocks nine.pairlist.net / hackrf-dev-bounces@greatscottgadgets.com # spam.spamrats.com # those block orange.fr... # dnsbl.sorbs.net # dnsbl-1.uceprotect.net # http://www.uceprotect.net/en/index.php?m=6&s=11 # apews is blocking online.net ip range # l2.apews.org # this is too restrictive # reject_rhsbl_sender dsn.rfc-clueless.org
those are closed
# The RFC-Ignorant.org DNS lists are closed effective 2012-10-30. # reject_rhsbl_sender bogusmx.rfc-ignorant.org, # reject_rhsbl_sender dsn.rfc-ignorant.org,
https://web.archive.org/web/20140213185822/http://spamlinks.net/filter-dnsbl-dead.htm
https://www.spamhaus.org/faq/section/DNSBL%20Usage
https://www.barracudacentral.org/rbl/how-to-use
https://www.dnsbl.com/2008/10/shutting-down-blacklists.html
Welcome to DNSBL.info https://www.dnsbl.info/
dnsbl resource https://www.dnsbl.com/
Which DNSBLs work well? https://www.dnsbl.com/2007/03/how-well-do-various-blacklists-work.html
What are spamtraps? https://www.spamresource.com/2007/02/what-are-spamtraps.html
Mail Spam Blacklists https://linuxreviews.org/Mail_Spam_Blacklists
w3bservice/Current Effective RBL Setup for Postfix 2017 https://gist.github.com/w3bservice/16f500e6c745aa6f3e6542ddc239c3c0
Postfix configure anti spam with blacklist https://www.cyberciti.biz/tips/postfix-spam-filtering-with-blacklists-howto.html
Blacklist & Whitelist with Postfix https://linuxlasse.net/linux/howtos/Blacklist_and_Whitelist_with_Postfix
Mimecast SMTP Error Codes https://community.mimecast.com/docs/DOC-1369
Prevent spam in Postfix https://support.rackspace.com/how-to/prevent-spam-in-postfix/
How-To: Fight SPAM with Postfix RBL https://www.debuntu.org/how-to-fight-spam-with-postfix-rbl/
https://www.linuxmagic.com/power_of_ip_reputation https://www.linuxmagic.com/products/bms/ https://www.linuxmagic.com/products/bms/blacklist_info https://www.linuxmagic.com/products/bms/mail_servers http://linuxmagic.ca/products/bms/install http://www.linuxmagic.ca/products/bms/whitelists
https://www.spamrats.com/about.php