za-smtp-inbound-2.mimecast.co.za 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 za-smtp-inbound-2.mimecast.co.za is not the root of its zone.
Instead, try zone transfer on mimecast.co.za .