On Fri, Jul 21, 2017 at 10:36:47PM +0200, Michael Büker wrote:
> sorry to bump myself here, but can anyone say if what I'd like is
> even possible with postfix?
Of course.
> Should this be a feature request to the devs, maybe?
If so that would be done here also.
> On 18.07.2017 13:02, Michael Büker wrote:
> >Here's two alternate ideas of how I would like postfix to behave
> >instead:
> >
> >1. Postfix should reject all mail that doesn't have a "From: "
> >identity associated with a relayhost in
> >sender_dependent_relayhost_maps.
You'd want a check_sender_access restriction lookup against the
sender address list.
A nice way to keep such a list in one file would be a sqlite
database. For the restriction it would simply return "OK":
[ main.cf ]
[ ... ]
sender_dependent_relayhost_maps =
sqlite:/path/to/sender/relay-query
smtpd_sender_restrictions = check_sender_access
sqlite:/path/to/sender/access-query, reject
The sender_dependent_relayhost_maps query would use the same sqlite
backend and same basic query, but the access query would have a
"result_format = OK".
(You can use any lookup table type you want, I am merely making a
suggestion in the interest of having all the data in one place.)
> >2. Postfix should *only* relay through one of the hosts in
> >sender_dependent_relayhost_maps (or deliver locally), and *never*
> >try to deliver directly to some external domain's MX.
That one could be done with "default_transport = error:not allowed"
and replacing sender_dependent_relayhost_maps with
sender_dependent_default_transport_maps.
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