mta3.anachron.com has no MX records.
Question and response
Question
dig mta3.anachron.com. MX
Answer
The response has no answer records.
Authority
anachron.com. 300 SOA ns1.sqr.nl. hostmaster.anachron.com. 2026011200 16384 2048 1048576 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0