On Sun, Jan 29, 2023 at 03:45:03PM +0200, e wrote:
> This is what the website says: "Subtle point: by default, address
> masquerading is applied only to message headers and to envelope sender
> addresses, but not to envelope recipients. This allows you to use
> address masquerading on a mail gateway machine, while still being able
> to forward mail from outside to users on individual machines."
>
> So if i have masquerade_domains = example.com And I send from
> gg.example.com, the sender will get replaced to example.com so the
> `return-path` is also example.com. When the receiver replies to the
> message, how can gg.example.com receive it? Since it gets sent to
> example.com
The "masquerade_domains" feature assumes that there is a flat logical
email address namespace, so that every user can be addressed as:
user@<masquerade-domain>.
However, each user's physical mailbox can be located in one
of many mailstores, and so internal delivery to the user's
physical mailbox is directed to that mailbox after alias
expansion:
us...@example.com u...@mailstore1.example.com
us...@example.com u...@mailstore2.example.com
...
In the case of Postfix, the alias expansion is best performed via
virtual(5) aliases, rather than the legacy Sendmail-compatible local
aliases(5). The latter are best used for just subscription lists,
with "owner-alias" bounce management, and perhaps a list manager
handling the recipient list.
--
Viktor.
