hostde5-3.fornex.org has no MX records.
Question and response
Question
dig hostde5-3.fornex.org. MX
Answer
The response has no answer records.
Authority
fornex.org. 300 SOA ns1.fornex.com. hostmaster.fornex.com. 2771905646 46800 1800 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0