INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :5.0.0

INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :5.0.0

Good afternoon. This error is occurring when sending mail. I have reviewed the MX and everything seems fine. I made a mail sending from a personal account to the same recipient, and however no error is presented, I did this to rule out that the recipient has a problem with his server.

I'll be grateful if you can help me solve it or tell me what I can do to solve it


-----------------------------------

This message was created automatically by mail delivery software. 
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. 

atrujillo@imupesa.com.pe INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :5.0.0 <atrujillo@imupesa.com.pe>... Mail refused 



Received:from mail.zoho.com by mx.zohomail.com 
    with SMTP id 1499983602514778.7804866636307; Thu, 13 Jul 2017 15:06:42 -0700 (PDT) 
Message-ID:<15d3dfd6350.f65295c2293917.9199171610991169343@mymsantarosadelima.com> 
Date:Thu, 13 Jul 2017 17:06:42 -0500 
From:Ricardo Padilla <admin@mymsantarosadelima.com> 
User-Agent:Zoho Mail 
To:"atrujillo" <atrujillo@imupesa.com.pe> 
Subject:Correo de prueba 
Content-Type:multipart/alternative; 
    boundary="----=_Part_923924_910059827.1499983602513"