ipt-mailgate-01.m2core.com.au IXFR zone transfer

Changes since SOA version

IXFR is a zone transfer request that returns changes since a specific SOA version. Enter the SOA version to request changes since then.

Not an apex domain The domain ipt-mailgate-01.m2core.com.au is not the root of its zone.
Instead, try zone transfer on m2core.com.au .