claro.net.pe has no MX records.
Question and response
Question
dig claro.net.pe. MX
Answer
The response has no answer records.
Authority
claro.net.pe. 600 SOA dns1.amx.com.pe. hostmaster.claro.net.pe. 2017050301 5400 600 90000 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0