On Sun, Nov 03, 2024 at 06:43:31PM +0100, Jaroslaw Rafa via Postfix-users wrote:
> Make sure that you DON'T list domain names included in "mydestination"
> parameter elsewhere, for example in virtual alias file.
This warrants some clarification:
- The actual requirement is to not list the same domain in multiple
"address classes". So no membership overlap among:
- mydestination # "local" address class
- virtual_alias_domains # "virtual alias" address class
- virtual_mailbox_domains # "virtual mailbox" address class
- relay_domains # "relay" address class
- So the above quoted advice is somewhat inaccurate. However,
Postfix 2.0 introduced a default backwards-compatibility setting
with Postfix 1.0 and 1.1, that even some users who started with
Postix later may be relying on:
$ postconf -d virtual_alias_domains
virtual_alias_domains = $virtual_alias_maps
Therefore, with the above setting, (I generally recommend setting
virtual_alias_domains explicity either empty or some separate list
or table) don't list "bare" domains as keys in any tables used for
"virtual_alias_maps", when this is also the set of tables
defining "virtual_alias_domains".
When virtual_alias_domains is its separate list, it is OK to
list what look like "bare" domains as keys in
"virtual_alias_maps", but they are then just localparts of
email addresses from "local" domains (or $myorigin, or qualified
with address literals in $proxy_interfaces).
So if foo.example is a local domain, and foo.example is also a
local email address you might have:
main.cf:
# Explicit either empty value, or in any case does not
# include "foo.example" as a literal element or as a key
# in a table element.
#
virtual_alias_domains = ...
mydestination = foo.example, ...
virtual_alias_maps = inline:{ {foo.example = postmaster} }
and then there's no conflict, email to "foo.example@foo.example"
will be delivered to the postmaster, as specified.
--
Viktor.
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