I have a domain with a catch-all address. The catch-all is very useful and I don't want to ditch it. But one of the drawbacks of a catch-all is that you wind up getting spam sent to addresses that otherwise wouldn't exist. To counter that, I'd like to blacklist a list of about 70 addresses which get nothing but spam so that mail to that address will bounce as an unknown user. What's the best way to do that in Zimbra?
At the previous host for this domain they had a Postfix access list style list I could put them in to make them bounce. Zimbra doesn't appear to have a way to add something to smtpd_recipient_restrictions as far as I can tell, though. Maybe I'm just looking in the wrong place? Or is there a better way to do this in Zimbra?
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