[exim] exim and rspamd (prevent emails from being analyzed)

Hello group.

I explain my work scenario. I use exim as smtp service, where I have black lists of domains in order to avoid analyzing emails that I know are garbage.

through spamassassin I did not have this problem, first the message came to exim and it discarded it, now the mail first arrives at rspamd and then exim discards it through its blacklist.

How can I prevent rspamd from analyzing emails from domains that I know send spam? Should I use a prefilter?

I use in exim this rule:
check_spam:
discard    senders = /opt/exim/deny_senders
 logwrite = REJECT Sorry, too much spam from TLD

Any ideas??

Aloha.!!!