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How could I block outgoing mail to a specific address using Postfix?

I've partially managed to block outgoing e-mail using header_checks. However, header_checks doesn’t cover BCC.

I also tested this solution: but it didn’t work.

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up vote 1 down vote accepted

As described in access(5), just add a check_recipient_access map to your smtpd_recipient_restrictions; if you wish to block these recipients for your own users too, make sure to place it before permit_mynetworks and/or permit_sasl_authenticated.

smtpd_recipient_restrictions = check_recipient_access hash:/etc/postfix/bad_recipients, permit_mynetworks, reject_unauth_destination, permit

And in /etc/postfix/bad_recipients: REJECT We don't like him REJECT Delivery to this user is prohibited
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We had a use-case for this scenario, where we needed to block some users receiving (opt-in) mailings from a list. Users that refused to press the "Unsubscribe" link in those user requested mailings (so, no, it wasn't spam). After a while we got abuse-mails from ISPs that got complaints from those weird lazy users, which was really time-consuming nonsense. So we decided to create a map for postfix. However, putting them in for a REJECT created new problems with the software sending them mail via postfix, so what we ended up doing was mapping this instead: DISCARD Delivery to this user is ignored as a result of annoying abuse-responses from even lazier ISPs.
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