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mail server's rebound email - reverse dns

By singmengyeong ·
Hi, with below rebound email...

-----Original Message-----
From: System Administrator [mailto:System Administrator]
Sent: Friday, May 06, 2016 11:22 AM
To: salina@abc.com
Subject: Delivery Failure


Could not deliver message to the following recipient(s):

Failed Recipient: info@def.com
Reason: Remote host said: 553 5.1.8 Client IP address 103.5.44.121 has no
reverse DNS entry


does it mean the reciepient's mail server has no reverse dns..and need them to enable reverse dns ?
my user can not receive email from one of the vendor Eg.. abc.com , our email can be delivered to them but they failed to get into our mailserver

kindly enlighten,

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