Install spamassassin

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sed -i "s/ENABLED=0/ENABLED=1/" /etc/default/spamassassin
sed -i "s/#CRON=1/CRON=1/" /etc/default/spamassassin
systemctl restart spamassassin

But I doubt that is your problem.

Check if the gmail message is arriving to your mail server (replace youraccount by the actual gmail account):

exigrep '<= [email protected]' /var/log/exim4/mainlog*
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