Undelivered Mail Returned to Sender

Undelivered Mail Returned to Sender

Please help me, if i am sending any email following error is coming

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.

vivek.shahi@medrev.in  INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :Verification failed for < sandeep.tripathi@medrev.in
            No Such User Here 
            Sender verify failed 

umesh.malik@medrev.in  INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :Sender verify failed 

mukesh.dubey@medrev.in  INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :Sender verify failed 



Received:from mail.zoho.com by mx.zohomail.com 
    with SMTP id 1490194316004305.94061254563246; Wed, 22 Mar 2017 07:51:56 -0700 (PDT) 
Message-ID:<15af680ba89.efdf 73eb365677.4573819607534043530@medrev.in
Date:Wed, 22 Mar 2017 20:21:55 +0530 
From:Sandeep Tripathi < sandeep.tripathi@medrev.in
User-Agent:Zoho Mail 
To:"Akshaysainihisar87" < Akshaysainihisar87@gmail.com
Cc:"Mukesh Dubey" < mukesh.dubey@medrev.in >, 
    "Umesh Malik" < umesh.malik@medrev.in >, 
    "Vivek Shahi" < vivek.shahi@medrev.in
Subject:Hospital Furniture_QUOTATION_22 March 2017_MedRev Healthcare Pvt 
Ltd 
Content-Type:multipart/mixed; 
    boundary="----=_Part_1149034_196244902.1490194315932"