AWS Route53 doesn't resolve my domain

I tried to administrate my domain by AWS route53, so I changed name server in domain administrater.('Domain administrater' means corporate which I got my domain name. I have no idea how to say about that, sorry.)

I got IPv4 by Elastic IP and I regestered my domain to A record in route53, with my Elastic IP.

That was OK. I could browse my page with my domain name.

And I tried to ready my mail account with my domain name, so I registered 'mail.MYDOMAIN' in MX record and A record with my Elastic IP.

Then DNS couldn't resolve my domain name.

I had no idea to resolve that, so I removed my all my record set, I made new record set.
And I changed name server in domain administrater too.
But DNS still doesn't work.

result of nslookup is here.

    $ nslookup MYDOMAIN
    Server:         10.0.1.1
    Address:        10.0.1.1#53

    ** server can't find kyttmmm.net: NXDOMAIN

    $ nslookup MYDOMAIN ns-1441.awsdns-52.org
    Server:         ns-1441.awsdns-52.org
    Address:        205.251.197.161#53

    Name:  MYDOMAIN
    Address: 52.68.XXX.XXX #exactly my EIP

Does anyone know cause about this?