ns.tele.net has no MX records.
Question and response
Question
dig ns.tele.net. MX
Answer
The response has no answer records.
Authority
tele.net. 600 SOA ns.tele.net. domain-admin.tele.net. 2025100101 10800 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0