Zoho server reply with error when Google Calendar send notification to our team member cpm.rs is hosted on Zoho

Zoho server reply with error when Google Calendar send notification to our team member cpm.rs is hosted on Zoho


Reporting-MTA: dns; googlemail.com
Arrival-Date: Tue, 24 Jan 2023 03:40:03 -0800 (PST)
X-Original-Message-ID: <calendar-6c648406-b041-4588-bdf0-b08a2d2e0a46@google.com>

Final-Recipient: rfc822; snezana.blazic@cpm.rs
Action: failed
Status: 5.2.3
Remote-MTA: dns; mx.zoho.com. (136.143.191.44, the server for the domain cpm.rs.)
Diagnostic-Code: smtp; 554 5.2.3 MailPolicy violation Error delivering to mailboxes
Last-Attempt-Date: Tue, 24 Jan 2023 03:40:06 -0800 (PST)

Regards, Milan Šmigić
CPM.rs
smigicm@cpm.rs