rev.dnainternet.fi has no MX records.
Question and response
Question
dig rev.dnainternet.fi. MX
Answer
The response has no answer records.
Authority
rev.dnainternet.fi. 657 SOA ns4.dnaip.fi. root.dnaip.fi. 1725280655 28800 3600 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0