On 6/3/2014 3:50 PM, Peter Bittner wrote:
> Hi,
>
> I'm trying to find out which is the correct way to configure alias
> domains on postfix.
>
> For example, I have 3 different domains (example.com, example.info,
> example.net), and when I send an e-mail to a user on any of the three
> domains it's always sent to "u...@example.com".
> In other words, I never need to configure mailboxes or users on any of
> the other two domains ("alias domains", as I call them). It's
> sufficient to have the user configured on the main domain.
>
> I've seen the following resources on that topic:
> - https://workaround.org/ispmail/wheezy/virtual-domains
> - http://www.postfix.org/VIRTUAL_README.html#forwarding
>
> Unfortunately, those resources only describe the following types of
> forwarding:
> - j...@example.info --> jane@somewhere-else
> - @example.info --> jim@somewhere-else (catch-all feature)
>
> What I would need is a correctly working solution of:
> - @example.info --> @somewhere-else, or
> - <any>@example.info --> <any>@somewhere-else
>
> Doing some tests with some test configuration
> sending/forwarding/retrieving seems to work (e-mails sent to one of
> the alias domains arrive at the main domain), but if there is a
> non-existing mailbox on the main domain and the e-mail is sent to the
> corresponding user at one of the alias domains no e-mail bounces back
> from the main domain saying that the mail could not be delivered.
>
> How can I make postfix bounce e-mails back when there is no user for
> it on the main domain? Is there a specific, standard way of doing
> alias domains on postfix? (It should be some kind of "standard
> use-case" after all, shouldn't it? Google Mail let you define alias
> domains on Google Apps, and that simply works.)
>
> Thanks in advance for any hints,
> Peter
>
If your mail is delivered locally to standard system users, you can
just add all the domains to mydestination and it just works; no
alias mapping needed, all users appear in all domains.
If the domains are virtual, you need to use 1-1 address mapping. Do
not use wildcard domain mapping, as wildcards defeat the automatic
recipient validation of postfix.
-- Noel Jones
