On Tue, Apr 11, 2023 at 12:49:18AM +0800, tom--- via Postfix-users wrote:
> > You can create virtual(5) aliases for any address you want, with
> > any syntactically valid rewrite target(s) of your choice.
> >
> > Neither the LHS nor the RHS addresses need be in domains under your
> > control. The virtual(5) alias table rewrites **all** recipient
> > addresses.
>
> Thank you. So what’s the usage of virtual alias domains?
Have you read:
https://www.postfix.org/ADDRESS_CLASS_README.html
The virtual alias domain class.
Purpose: hosted domains where each recipient address is aliased to an
address in a different domain, for example, a local UNIX system account
or a remote address. A virtual alias example is given in the
VIRTUAL_README file.
Domain names are listed in virtual_alias_domains. The default value is
$virtual_alias_maps for Postfix 1.1 compatibility.
Valid recipient addresses are listed with the virtual_alias_maps
parameter. The Postfix SMTP server rejects invalid recipients with "User
unknown in virtual alias table". The default value is $virtual_maps for
Postfix 1.1 compatibility.
There is no mail delivery transport parameter. Every address must be
aliased to an address in some other domain.
Which also links to:
https://www.postfix.org/VIRTUAL_README.html#canonical
Perhaps implicit in the above references is that Postfix accepts
incoming mail for (valid) recipients in virtual_alias_domains, even when
the client is not listed in mynetworks or SASL authenticated, ...
--
Viktor.
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