How to set exim accept incoming mail from only allowed hosts?

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I have setup a mail gateway in front of exim. Bu sometimes, spammer may directly delivery mails to exim ip so spam mails passes mail gateway. So I need to set a filter for SOME domains (in multidomain enviroment), to only accept mails from mail gateway only. I can do that at server-wide with firewall. But in exim there are some domains not using mailgateway, so I need to do it at domain level in exim. Any solution is welcome :)

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