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I'm trying to configure a change of subject for incoming emails based on the "To:" address of the (virtual) email address, rather unsuccessfully. I run into two problems.

The first problem is that I can't seem to find a proper way to change the subject line based on the "To:" address. I have:

In main.cf:

header_checks= pcre:/etc/postfix/header_checks

and in header_checks:

if /^To: test@example\.com/
/^Subject: (.+)$/ REPLACE Subject: [TEST] $1
endif

pcre is installed, but the rule doesn't seem to be applied. I tried testing it with

postmap -q "To: test@example.com" pcre:/etc/postfix/header_checks

and there is no output of that command. I am unsure whether this means that the rule did not apply or whether it doesn't show anything due to the application of a rule regarding the subject although the test is on the to header.

The second problem is that when I replace the entire file header_checks by this:

/^To: test@example\.com/ REJECT

...I can successfully test it with postmap -q (yield REJECT), but incoming mail isn't actually rejected. So I'm guessing this is another issue in addition to the one above.

Thanks.

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