intra.sonera.fi has no MX records.
Question and response
Question
dig intra.sonera.fi. MX
Answer
The response has no answer records.
Authority
intra.sonera.fi. 3600 SOA nasu.intra.sonera.fi. dns.telia.fi. 2020081415 7200 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0