relay.minicall.com has no MX records.
Question and response
Question
dig relay.minicall.com. MX
Answer
The response has no answer records.
Authority
minicall.com. 3600 SOA global.excedodns.com. hostmaster.excedo.se. 1741698638 3600 900 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0