app has no MX records.
Question and response
Question
dig app. MX
Answer
The response has no answer records.
Authority
app. 900 SOA ns-tld1.charlestonroadregistry.com. cloud-dns-hostmaster.google.com. 101427 21600 3600 259200 900
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0