mail.fastxs.net has no MX records.
Question and response
Question
dig mail.fastxs.net. MX
Answer
The response has no answer records.
Authority
fastxs.net. 1800 SOA ns1.msgc.ac. hostmaster.fastxs.net. 2024082107 86400 7200 3600000 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0