INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :Rule imposed mailbox access for it@masora.ch refused

INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :Rule imposed mailbox access for it@masora.ch refused

Hi, we've got the problem with email such as :

Reporting-MTA: dns; mx.zohomail.com
Arrival-Date: Fri, 06 Dec 2019 09:31:36 -0800
Original-Recipient: rfc822; <xxx@xxxx.xx>
Final-Recipient: rfc822; xx@xxxxx.xx
Status: 550
Action: failed
Last-Attempt-Date: 6 Dec 2019 17:31:45 GMT
Diagnostic-Code: xx@xxxx.xx INVALID_ADDRESS, ERROR_CODE :550,
ERROR_CODE :Rule imposed mailbox access for xx@xxxxx.xx refused

Received:from mail.zoho.com by mx.zohomail.com
with SMTP id 1575653496617332.9857743811922; Fri, 6 Dec 2019 09:31:36
-0800 (PST)
Date:Fri, 06 Dec 2019 09:31:36 -0800
From:xxxxxx <xxxx@xxxxxx.com>
User-Agent:Zoho Mail
To:<xx@xxxxx.xx>
Cc:<xxxx@xxxxx.com>
Subject:Re:[## 104252 ##] xx@xxxx.xx
Content-Type:multipart/alternative;
boundary="----=_Part_293122_1247229793.1575653496612"
 

Changed SPF record acxording to this acticle:

Please help with this issue.