mer-nm.internl.net has no MX records.
Question and response
Question
dig mer-nm.internl.net. MX
Answer
The response has no answer records.
Authority
mer-nm.internl.net. 3600 SOA auth10.dns.internl.net. hostmaster.internl.net. 2024050710 3600 7200 604800 3600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0