186.43.31.rev.aif.tel has no MX records.
Question and response
Question
dig 186.43.31.rev.aif.tel. MX
Answer
The response has no answer records.
Authority
186.43.31.rev.aif.tel. 10800 SOA rdns1.airmob.eu. hostmaster.airmob.net. 202509100 14400 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0