This issue comes back to me every month or so when our Barracuda sends out a monthly report and people ask why are we sending out spam and viruses. Again, these are all bounces from the iredmail server which is setup to use the Barracuda as a smart host. If turning off spam bounces is a bad idea, I revert back to the question, why is the system accepting email to non-existent users? Shouldn't it be using "local_recipient_maps" or other method to avoid accepting email addressed to people that don't exist in the first place?
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