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 b237-84.smtp-out.us-west-2.amazonses.com is not the root of its zone.
Instead, try zone transfer on smtp-out.us-west-2.amazonses.com .
Instead, try zone transfer on smtp-out.us-west-2.amazonses.com .