> How will SMTP servers vet sources of inbound messages within an IPv6 > environment? I don't know, but except for very limited corner cases, trying to use a source address to vet the source in an IPv4 environment is foolish and error-prone. It is no less foolish and error-prone in IPv6, but that's not the fault of IPv6. Keith _______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf