case_randomization

Since: Version 2025.05.06-b29689af

The functionality described in this section requires version 2025.05.06-b29689af of KumoMTA, or a more recent version.

Boolean. When true, the resolver randomizes the case of letters in query names and requires that responses echo the same case. This implements the mechanism described in draft-vixie-dnsext-dns0x20-00 and is a mitigation against blind cache-poisoning attacks. Only applies over UDP. Defaults to false.