net.encoline.de has no MX records.
Question and response
Question
dig net.encoline.de. MX
Answer
The response has no answer records.
Authority
net.encoline.de. 57600 SOA avalon.iks-jena.de. hostmaster.iks-jena.de. 2026022201 28800 3600 3600000 57600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0