ruby.unixbsd.info has no MX records.
Question and response
Question
dig ruby.unixbsd.info. MX
Answer
The response has no answer records.
Authority
unixbsd.info. 86400 SOA ns2.unixbsd.info. support.psychz.net. 2023082901 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0