spf.uio.no has no MX records.
Question and response
Question
dig spf.uio.no. MX
Answer
The response has no answer records.
Authority
uio.no. 43200 SOA ns1.uio.no. hostmaster.uio.no. 3260223010 10800 3600 1814400 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0