exim: skip greylisting for trusted hosts

As a webhosting provider, I would like to be able to set EXIM to skip greylisting for /etc/trustedmailhosts or have a whitelist file that covers both greylisting and /etc/trustedmailhosts usage to allow mail from trusted hosts to come through.

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It would be wonderful if exim would skip greylisting for /etc/trustedmailhosts.

OR there should be a whitelist file that would cover both greylisting and /etc/trustedmailhosts usage.

Thanks!