ns1.telmex.net.pe has no MX records.
Question and response
Question
dig ns1.telmex.net.pe. MX
Answer
The response has no answer records.
Authority
telmex.net.pe. 3600 SOA dns1.amx.com.pe. hostmaster.telmex.net.pe. 2012120410 5400 600 90000 7200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0