Since version 4.0.0, PowerDNS requires that masters sign their
notifications. During transition and interoperation with other nameservers,
you can use options **allow-unsigned-notify** to permit unsigned
-notifications. For 4.0.0 this is turned off by default, but it might be
-turned on permanently in future releases.
+notifications. For 4.0.0 this is turned on by default, but it might be
+turned off permanently in future releases.
## IXFR: incremental zone transfers
If the 'IXFR' zone metadata item is set to 1 for a zone, PowerDNS will attempt to retrieve