[exim] whitelisting single domain for recipient check

I have a trusted domain we relay to that is not responding to exim
recipient checks. Is there something I can add to the following that
will allow that domain to be whitelisted from checks?

drop    message       = REJECTED - Recipient Verification Failed - User 
Not Found
           domains       = +smtp_callback_domains
           !verify       = recipient/success_on_redirect/callout=2m,defer_ok

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Raymond Norton
LCTN
952.955.7766