_spf.rediffmailpro.com has no MX records.
Question and response
Question
dig _spf.rediffmailpro.com. MX
Answer
The response has no answer records.
Authority
rediffmailpro.com. 1800 SOA ns1.rediff.com. webmaster.rediff.co.in. 2026022703 3600 7200 7200 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0