correo.optical.pe has no MX records.
Question and response
Question
dig correo.optical.pe. MX
Answer
The response has no answer records.
Authority
optical.pe. 3600 SOA ns1.opticalip.com.pe. hostmaster.opticalip.com.pe. 2026022000 3600 1800 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0