We use postfix, on out internet mail gateway, and have been used to send backscatter spam die to the fact that we have had most of our reject codes set to 550, e.g. unknown_address_reject_code = 550
What code should I use to just drop the message with no warning/auto reply?
In the mean time I have set the server to 450, but this will (eventually) cause a bounce from the originating server.
I read somewhere that i could use REJECT, but can't find any mention of that in the postfix documentation.
Any pointers would be hugely appreciated.
Thanks for reading.