o1.ptr3040.smtagent.com has no MX records.
Question and response
Question
dig o1.ptr3040.smtagent.com. MX
Answer
The response has no answer records.
Authority
smtagent.com. 3600 SOA ns0.wixdns.net. support.wix.com. 2018090440 10800 3600 1209600 3600
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0