Accepting mail to system accound only from local

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Accepting mail to system accound only from local

Yasuhiro KIMURA
Hello,

I have a Debian host that works as mail server. Recently spam mails
began to be sent to some system accounts. Right now most of them are
rejected by spam filter.  But if possible I would like to configure
Postfix so it only accepts mail to system account from local and
rejects one from remote. Is there any way to achieve it?

Best Regards.