_spf.recruiting-portal.com has no MX records.
Question and response
Question
dig _spf.recruiting-portal.com. MX
Answer
The response has no answer records.
Authority
recruiting-portal.com. 300 SOA ns1101.ui-dns.biz. hostmaster.1and1.com. 2017071245 28800 7200 604800 300
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0