ns1.rediff.com has no MX records.
Question and response
Question
dig ns1.rediff.com. MX
Answer
The response has no answer records.
Authority
rediff.com. 1800 SOA ns1.rediff.com. webmaster.rediff.co.in. 2026030202 86400 7200 3628800 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0