ns.eu.uu.net has no MX records.
Question and response
Question
dig ns.eu.uu.net. MX
Answer
The response has no answer records.
Authority
ns.eu.uu.net. 21600 SOA auth200.ns.uu.net. ssm-dns-admins.EU.UU.NET. 299 21600 3600 1728000 21600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0