ipv6.hosted.by.bitency.net has no MX records.
Question and response
Question
dig ipv6.hosted.by.bitency.net. MX
Answer
The response has no answer records.
Authority
bitency.net. 3600 SOA ns1.bitency.net. hostmaster.bitency.net. 2026030600 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0