lan-1.7.173.243.maa.sify.net has no MX records.
Question and response
Question
dig lan-1.7.173.243.maa.sify.net. MX
Answer
The response has no answer records.
Authority
maa.sify.net. 86400 SOA syslog.maa.sify.net. hostmaster.sify.net. 2000101980 10800 3600 604800 86400
Additional
The response has no additional records.