On Thu, Jun 23, 2022 at 02:43:02PM -0700, Derek B. Noonburg wrote:
> I'm running postfix to handle email for several users. One of them
> has a .forward file that points to a gmail address. Gmail's servers
> are rejecting some email for various causes ("low reputation of
> sending domain", SPF failures).
>
> The problem is that postfix then bounces the email back to the (likely
> forged) sender, which means my server is sending backscatter.
>
> What I'd like to do is silently drop any email that's rejected by the
> target of a .forward file. Is there some way to configure postfix to
> do that? Or some better way of handling this problem?
If you can convince the user to surrender the alias management to you,
then you instead configure:
owner-user: user
user: some.a...@gmail.com
And presto magic, email to gmail will be forwarded with an envelope
sender address that no longer fails SPF checks. DKIM should continue
to work, because the message content will not be modified in transit.
I just don't expect that owner-aliases can be sensibly combined with
.forward files. Though perhaps local(8) manages to pull off that magic
much to my surprise.
--
Viktor.
