pdx-out-004.esa.us-west-2.outbound.mail-perimeter.amazon.com 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 pdx-out-004.esa.us-west-2.outbound.mail-perimeter.amazon.com is not the root of its zone.
Instead, try zone transfer on us-west-2.outbound.mail-perimeter.amazon.com .