inaddr.ip-pool.com has no MX records.
Question and response
Question
dig inaddr.ip-pool.com. MX
Answer
The response has no answer records.
Authority
inaddr.ip-pool.com. 2560 SOA ns1.nameserverservice.de. hostmaster.ns1.nameserverservice.de. 2026022513 10800 3600 604800 3600
Additional
The response has no additional records.