mx.tischer.me has no CNAME records.
Question and response
Question
dig mx.tischer.me. NS
Answer
The response has no answer records.
Authority
tischer.me. 3600 SOA dns.tischer.me. hostmaster.tischer.me. 1209447728 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0