Spam blocking generating "Mailbox does not exist" emails

[David Hearn]

I'm running Cyrus/Postfix + Amavis/SpamAssassin

When spam comes in addressed to mailboxes which don't exist, Postfix is generating Undelivered Mail Returned to Sender messages - often of which these just build up because the from/reply-to address is fake.

Is there anything I can do about this?  Is this a setting of Postfix or Amavis?

Thanks

David Hearn
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