porthos.fcm.uncu.edu.ar has no MX records.
Question and response
Question
dig porthos.fcm.uncu.edu.ar. MX
Answer
The response has no answer records.
Authority
fcm.uncu.edu.ar. 86400 SOA ns1.fcm.uncu.edu.ar. root.fcm.uncu.edu.ar. 2026030301 24000 1800 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0