a.nic.uy has no MX records.
Question and response
Question
dig a.nic.uy. MX
Answer
The response has no answer records.
Authority
nic.uy. 120 SOA seciu.edu.uy. admin.seciu.edu.uy. 2025110411 10800 3600 432000 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0