Global recipient blacklist in postfix
Posted on 2011-03-23
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?