mail1.nebula.fi has no CNAME records.
Question and response
Question
dig mail1.nebula.fi. NS
Answer
The response has no answer records.
Authority
nebula.fi. 2035 SOA namesurfer.inet.fi. hostmaster.telia.fi. 2026022516 28800 7200 3456000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0