The mail system
<zzzz @ zzz.com>: host mx.zohomail.com said: 541 5.7.1
Mail rejected due to antispam policy (in reply to RCPT TO command)
Reporting-MTA: dns; xxx.xxxx.com
X-Postfix-Queue-ID: 5D479698B31
X-Postfix-Sender: rfc822; vvv @ vvvv.net
Arrival-Date: Tue, 22 Nov 2022 10:16:34 +0100 (CET)
Final-Recipient: rfc822; zzzz @ zzz.com
Original-Recipient: rfc822;zzzz @ zzz.com
Action: failed
Status: 5.7.1
Remote-MTA: dns; mx.zohomail.com
Diagnostic-Code: smtp; 541 5.7.1 Mail rejected due to antispam policy