"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.

p****o@c******re.com.br  INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :Verification failed for < s******a@p*************a.com.br >
                        No Such User Here
                        Sender verify failed

 Received:from  mail.zoho.com  by  mx.zohomail.com
        with SMTP id 1515683211648358. 8719889266538; Thu, 11 Jan 2018 07:06:51 -0800 (PST)
 Message-ID:< 160e5c26962.11a25132f56773.3741998504044130904@p*******a.com.br >
 Date:Thu, 11 Jan 2018 13:06:51 -0200
 From:P*****a C******a < s*******a@p**********a.com.br >
 User-Agent:Zoho Mail
 To:"p******o" < *********o@c*******e.com.br >
 Subject:Fwd:
 Content-Type:multipart/ alternative;
        boundary="----=_Part_176677_ 1655394307.1515683211632"

SPF is OK

MX is OK

DKIM is OK

What is happening?

The recipient email receives (logs):

Event: rejected rejected

User: -remote-

Domain:

Source address: s******a@p*******a.com.br

Sender:

Time of sending: 11/01/2018 13:33:13

Sender host: sender-of-o52.zoho.com

IP address of the sender: 135.84.80.21

Authentication: unauthorized

Spam Score: 0

Recipient: p******o@c*****e.com.br

Delivery address: c*****e

Domain of delivery: c*******r

Delivered to:

Router: reject

Transportation: ** rejected **

Time to expire: 11/01/2018 13:33:13

ID: 1eZeqz-0005Xb-IJ

Delivery Host: sender-of-o52.zoho.com

Shipping address: 135.84.80.21

Size: 0 bytes

Result: Sender verify failed