Thank you for your interest, Viktor.

2012/12/20 Viktor Dukhovni <postfix-us...@dukhovni.org>:
> Instead of resolving an unmodified rfc822 address to a different
> transport:nexthop, rewrite the rfc822 address (via virtual_alias_maps)
> to a domain which is routed (via MX records or per-nexthop transport
> table entries) to that transport:nexthop.

So, the virtual_alias_maps should look like:
foo...@example.com        foo...@internal.example.com

I guess, I should configure the internal machine like is explained in
http://www.postfix.org/STANDARD_CONFIGURATION_README.html#local_network
(with default mydestination, that is, without $mydomain).
There is a ticketing system in the internal machine that
sends/receives email in the form of foo...@example.com and, with that
configuration, the machine will start to receive mails
foo...@internal.example.com.
Is there a way to re-convert foo...@internal.example.com to foo...@example.com?

> It is generally a good idea to add the users in question to ldap.
> For each user define a "maildrop" attribute which routes their
> mail to the appropriate destination address (often the same
> as the lookup key).

My LDAP server is Windows AD so I haven't the flexibility to do that. :(

If I use the rewriting method you explained above, would I need
including all users in local_recipient_maps?

Ignacio

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