I am getting this delivery failure for emails sent to a specific domain, how do I resolve this?

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THIS IS A WARNING MESSAGE ONLY.

YOU DO NOT NEED TO RESEND YOUR MESSAGE.

The original message was received at Wed, 29 Mar 2017 04:05:55 -0700  from namit@datastatglobal.com [namit@datastatglobal.com]

    ----- The following addresses had fatal errors -----   

   [Status: DOMAIN_NOT_RESOLVED, Address: <xx@hcl.com>, DOMAIN_NOT_RESOLVED]

Message will be retried for 4 more day(s)

    ----- Transcript of session follows -----   

 Received:from Namit (150.129.183.247 [150.129.183.247]) by mx.zohomail.com

                with SMTPS id 1490782680539949.7041828640067; Wed, 29 Mar 2017 03:18:00 -0700 (PDT)  Message-ID:<08fc01d2a875$9b89b920$d29d2b60$@datastatglobal.com>

 Date:Wed, 29 Mar 2017 15:46:59 +0530

 From:"Namit Sardana" <namit@datastatglobal.com>  To:"xx'" <xx@hcl.com>

 Subject:RE: March 2017 time sheet

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