undelivered email actually received. How to stop???

undelivered email actually received. How to stop???

I get this:

ERROR_CODE :421, ERROR_CODE :Read timed out 



Received:from mail.zoho.com by mx.zohomail.com 
    with SMTP id 1511943217211556.1745190690739; Wed, 29 Nov 2017 00:13:37 -0800 (PST) 
Message-ID:<16006d6a018.ad2 4669a98695.6865978820296378441@3dvrsolutions.co.nz
Date:Wed, 29 Nov 2017 21:13:37 +1300 
From:Gianfranco Favero <!%$@7975
User-Agent:Zoho Mail 
To:
Subject:Re: 360 footage 
Content-Type:multipart/alternative; 
    boundary="----=_Part_237253_1860808359.1511943217194"

BUT the email has been delivered and the recipient is still getting a new mail from me every 2 hours for 3 days. How can I stop it from re-sending?