mail-ru-sender01b.prod.mail.amosrv.ru 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 mail-ru-sender01b.prod.mail.amosrv.ru is not the root of its zone.
Instead, try zone transfer on mail.amosrv.ru .