mx3.grupofame.com has no MX records.
Question and response
Question
dig mx3.grupofame.com. MX
Answer
The response has no answer records.
Authority
grupofame.com. 86400 SOA dns33098.dizinc.com. root.server5.grupofame.com. 2026012201 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0