cashcows.me has no MX records.
Question and response
Question
dig cashcows.me. MX
Answer
The response has no answer records.
Authority
me. 3600 SOA a0.nic.me. hostmaster.donuts.email. 1772120084 7200 900 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0