mta.seciu.edu.uy has no MX records.
Question and response
Question
dig mta.seciu.edu.uy. MX
Answer
The response has no answer records.
Authority
seciu.edu.uy. 86400 SOA seciu.uy. teccom.seciu.uy. 202602260 10800 3600 432000 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0