This was fixed upstream, as mentioned in the upstream bug this is linked to. What might not be obvious from that bug is that you get the fix by running sa-update, to get an updated set of rules, which you should be doing daily from cron anyway. So there is nothing that needs to be done to the ubuntu packaging (for any 3.3.0 or newer release).
You can verify by making sure these two rules are not in the rules you're using: DNS_FROM_RFC_BOGUSMX DNS_FROM_RFC_DSN In /var/lib/spamassassin/3.004000/updates_spamassassin_org . ** Changed in: spamassassin (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to spamassassin in Ubuntu. https://bugs.launchpad.net/bugs/1064541 Title: rfc-ignorant.org will stop working soon To manage notifications about this bug go to: https://bugs.launchpad.net/spamassassin/+bug/1064541/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs