mail00.pacnet.net has no MX records.
Question and response
Question
dig mail00.pacnet.net. MX
Answer
The response has no answer records.
Authority
pacnet.net. 3600 SOA ns1.asianetcom.net. dns\.admin.asianetcom.com. 2026012300 21600 1800 1209600 86400
Additional
. 0 OPT ; payload 1392, xrcode 0, version 0, flags 0