Getting INVALID_ADDRESS,ERROR_CODE:550 error

Getting INVALID_ADDRESS,ERROR_CODE:550 error

While replying to a particular customer mail im getting below error. Kindly help resolve this asap

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eric.neilmann@take5shop.com INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :relay not permitted 

Received:from mail.zoho.com by mx.zohomail.com 
    with SMTP id 1475176699158812.0140145798734; Thu, 29 Sep 2016 12:18:19 -0700 (PDT) 
Message-ID:<15777621511.fb751bc120092.5297083839672741592@crudeco.in
Date:Fri, 30 Sep 2016 00:48:19 +0530 
From:mile4u <admin@crudeco.in
User-Agent:Zoho Mail 
To:"eric.neilmann" <eric.neilmann@take5shop.com
Subject:Re:Enquiry Eric Neilmann 
Content-Type:multipart/alternative; 
    boundary="----