[Added mailop as CC.] On Thursday 11 February 2021 16:34, Dave Crocker wrote: > A basic issue I've tried to raise but finally gave up on is that email > relaying means that a message can start in a v4 environment and then > transit a v6 one. The Originator has no control over that. > > So differential rules for v6 and v4 doesn't actually make sense, unless > the receiving server can tell whether the message has gone more than one > hop...
Or the receiver (final hop or not) has different technical capabilities for filtering IPv6 and IPv4 message sources. For example, RBL operators haven't (yet?) scaled to mapping bad IPv6 space to the same level as IPv4 space. This means that (as Alex already noted) domain reputation may come into play more than with IPv4 sources, particularly for smaller sites. Until technical parity exists between how each space is evaluated, they'll be treated differently. Ken. _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
