mx.presssonic.net has no CNAME records.
Question and response
Question
dig mx.presssonic.net. NS
Answer
The response has no answer records.
Authority
presssonic.net. 3439 SOA dns.presssonic.net. hostmaster.presssonic.net. 1230907950 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0