actonsoftware.com.2.0001.arsmtp.com has no CNAME records.
Question and response
Question
dig actonsoftware.com.2.0001.arsmtp.com. NS
Answer
The response has no answer records.
Authority
0001.arsmtp.com. 406 SOA mdns1.appriver.com. support.appriver.com. 11123645 900 600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0