mail2.crcltd.com.do has no MX records.
Question and response
Question
dig mail2.crcltd.com.do. MX
Answer
The response has no answer records.
Authority
crcltd.com.do. 3600 SOA pdns01.domaincontrol.com. dns.jomax.net. 2026022500 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0