My admin account receives emails but other account showing error

My admin account receives emails but other account showing error

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Undelivered Mail Returned to Sender[adenekan.adebayo@newadroit.com


Received:from mail.zoho.com by mx.zohomail.com 
    with SMTP id 1548878460870670.0510039277247; Wed, 30 Jan 2019 12:01:00 -0800 (PST) 
Message-ID:<168a059b7c4.eb4ef77e41601.4055535602028910960@newadroit.com
Date:Wed, 30 Jan 2019 21:01:00 +0100 
From:admin@newadroit.com 
User-Agent:Zoho Mail 
To:"adenekan.adebayo" <adenekan.adebayo@newadroit.com
Subject:Re: Testing 123444 
Content-Type:multipart/alternative; 
    boundary="----=_Part_133330_48005679.1548878460869"from mail.zoho.com by mx.zohomail.com 
    with SMTP id 1548878460870670.0510039277247; Wed, 30 Jan 2019 12:01:00 -0800 (PST)
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