Robert Fitzpatrick:
> >> I have a Postfix 2.8.5 server that is a gateway transport for several
> >> domains and it is sending backscatter when the transport map destination
> >> rejects user unknown.
> Further examination of the MAILER_DAEMON messages show the transport
> destination server rejecting the message...
>
> <stahl1970@transportdomain>: host x.x.x.x[x.x.x.x] said: 550 5.1.1 User
> unknown (in reply to RCPT TO command)
The down-stream server is working exactly as it should. All
you need on the gateway server is a way to block such mail,
instead of accepting it from the Internet.
- First choice: populate relay_recipient_maps. This requires
some arrangements to maintain an up-to-date table.
- Second choice: put "reject_unverified_recipient" after
"reject_unauth_destination". This works immediately.
Wietse
