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Global recipient blacklist in postfix

We are using postfix as an outbound-only mail relay, primarily to send newsletters and registration confirmations to our customers.

We would like to implement a company-wide recipient blacklist, not just at the application level, but also at the postfix level, as a final catch for legacy applications that might be sending mails that we don't know about.

Is there some way of giving postfix a global list of external recipients, to whom no emails should ever be sent?

Many thanks
Jon Little
Verivox GmbH
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pilson66
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