> Why are reverse MX records or domain specific DNSBLs any harder to > maintain that regular MX records? it depends on how often the data changes. most MX records are fairly static. DNSBLs are centrally managed, which is different. Keith _______________________________________________ Asrg mailing list Asrg@ietf.org https://www1.ietf.org/mailman/listinfo/asrg