ip.retelit.net has no MX records.
Question and response
Question
dig ip.retelit.net. MX
Answer
The response has no answer records.
Authority
ip.retelit.net. 86400 SOA ns1.retelit.net. hostmaster.enter.it. 2025033103 86400 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0