How to block the mails by subject in exim

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Suppose you want to block the mails having subject job
Open the file /etc/mail/spamassassin/local.cf
And add the following lines.

header   JOB_SUBJECT Subject =~ /job/i
header   JOB_FROM    From =~ /job/i
meta     JOB_HEADER JOB_FROM && JOB_SUBJECT
score    JOB_HEADER 10.0
describe JOB_HEADER Block Mails with job in subject

save the file and restart the exim service if needed.