[Exim] question regarding exiscan

hello there

i have here a short question, i use here for specific reasons a catchcall
account for 3 domains which will piped to an webmailsystem. - is there a way
to exclude the exiscan (spamassassin) for that specific catchcallaccount to
be exiscanprocessed?

running exim 4.14

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exiscan_condition = probably i have to set something here..
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thanks for any notes

kind regards

christian