On Sat, Jun 21, 2025 at 01:31:01PM +0200, Christian H. Kuhn via Postfix-users
wrote:
> > Assign both instances explicit distinct $myhostname values.
>
> But i started rethinking the whole setup. And it does not end with removing
> localhost ip from the public instance. What is the idea behind the complete
> construction? To prevent spam, virusses, ... from being delivered. And how
> much spam might come from the null client instance where only local programs
> may send?
>
> So i will change local transport from relay to lmtp.
In a typical null-client I'd expect local_transport to never happen,
instead all mail goes via SMTP to the "smart" instance. But also,
being a null-client there would typicall also be no SMTP listener!
main.cf:
# Punt all mail to the "smart" queue or front-end filter
default_transport = smtp:[127.0.0.1]:26
relay_domains =
mydestination =
virtual_alias_domains =
virtual_mailbox_domains =
# No SMTP listener
master_service_disable = inet
# Since no local domains
alias_maps =
alias_database =
local_recipient_maps =
local_transport = error:5.1.2 Mailbox unavailable
...
With the above, you get just local submission. Otherwise you're looking
at not a null-client but an input instance, So what use case is this???
Is the front-end instance receiving mail from outside or not?
--
Viktor.
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