Hello everyone the problem persists. Maybe I’m doing something wrong.

Step 1, I add the rule in the /etc/postfix/header_checks file

/^Subject:.*You may need to add/ DISCARD TMP_BLOCK

Step 2, postmap /etc/postfix/header_checks and postfix surcharge.

Are these steps correct?

Could the problem occur because the postfix-regexp library is not installed?
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