[CentOS] Large scale Postfix/Cyrus email system for 100, 000+ users

[Matt Shields]

On 10/23/07, mouss <mlist.only at free.fr> wrote:
> There are primarily two ways:
>
> [virtual aliase]
> you can use virtual_alias_maps to redirect foo at example.com to
> foo at hostN.example.com, provided the final server accepts such addresses.
>
> If the final server doesn't accept these, and you use smtp to relay to,
> then you can write the addresses back, using smtp_generic_maps.
>
> [transport]
> an laternative is to use use (per-user) transport_maps. something like
>
> foo at example.com         relay:[hostN.example.com]
>
>
> In bothe approaches, the mappings can be generated using sql statements
> (mostly CONCAT). something like
> ...
> query = SELECT concat('relay:[', host, '.example.com]')
>         FROM User
>         where '%u' = user and '%d' = domain
>
> you get the idea I hope.
>
>
>
> >
> > Anyone have a working example that they could share?  It would be
> > greatly appreciated.
> >

Forward's aren't acceptable.  There is a way to do it with the
transport function and lmtp on a account by account basis.  I'm
looking for real world configs from someone that has this working.

-matt