FYI: NANOG Mailing List IPV4 hosts are in Spamhaus RBL

This from one of the mail servers I manage: H=lists.nanog.org [50.31.151.68] F=<nanog-bounces@lists.nanog.org> rejected RCPT <[x](mailto:nanog2@adns.net)xxxx@yyyyy.com>: host is listed in sbl.spamhaus.org Not sure anyone cares - mail still comes in via the IPv6 interface, but interesting that the listserv tries IPV4 1st.