dns1.cotas.com.bo has no MX records.
Question and response
Question
dig dns1.cotas.com.bo. MX
Answer
The response has no answer records.
Authority
cotas.com.bo. 86400 SOA dns2.cotas.com.bo. postmaster.com.bo. 1989020550 10800 3600 3600000 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0