I have added the blacklist in who objects .*klaviyomail.com, But the mails are still received from spammers with the same domain pattern.
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Apr 4 07:04:34 proxmox postfix/smtpd[8468]: connect from unknown[192.168.2.1]
Apr 4 07:04:34 proxmox postfix/smtpd[8468]...