mx1.filter.localtel.net has no MX records.
Question and response
Question
dig mx1.filter.localtel.net. MX
Answer
The response has no answer records.
Authority
localtel.net. 3600 SOA ns1.nwinternet.com. hostmaster.nwinternet.com. 2026022000 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0