personalmail.bancotui.com has no MX records.
Question and response
Question
dig personalmail.bancotui.com. MX
Answer
The response has no answer records.
Authority
bancotui.com. 3600 SOA dns1.cloud.claro.com.do. bancotui.claro.net.do. 3110620 14400 7200 2419200 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0