spf.mailengine.hu has no MX records.
Question and response
Question
dig spf.mailengine.hu. MX
Answer
The response has no answer records.
Authority
hu. 3600 SOA a.hu. hostmaster.nic.hu. 1772352650 3600 900 259200 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0