From: Victor Duchovni (Victor.DuchovniMorganStanley.com)
Date: Tue May 03 2005 - 08:14:51 CDT

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On Tue, May 03, 2005 at 11:10:37AM +0200, Jaskula Thomas wrote:

> Hello,
>
> I have one question about postfix configuration but I didn't find anything
> in the documentation. I'll try to give an example and if someone could say
> me if it's possible I'll greatly appreciate.
> I have two domains "mypublic.com" which is public domain and
> "myinternal.com" which is for internal use only. "mypublic.com" is a postfix
> server and "myinternal.com" is MS Exchange server. People with
> "myinternal.com" accounts can only send mails to other internal accounts.
> People with "mypublic.com" can send to both domains. If someone from
> "mypublic.com" sends an email to several people (public and internal domain)
> all email addresses with "myinternal.com" should be deleted from headers. So
> if someone receives the mail he shouldn't see any "myinternal.com" mails
> when he does reply to all. Is that configuration possible with postfix?
>

The generic(5) and canonical(5) rewriting mechanisms are 1-to-1, the
only 1-many rewriting mechanisms are aliases(5) and virtual(5) and these
apply to the envelope recipient only.

If you don't want to make the internal recipients externally addressable,
the best you can do is to rewrite each internal address to a discarded
external address.

        interal.com nobodymypublic.com

with "nobody" an account that is silently delivered to /dev/null or the
discard transport (Postfix 2.2).

This will prevent unwanted bounces to Reply-All.

BEFORE: Cc: user1internal.com, user2internal.com
AFTER: Cc: nobodymypublic.com, nobodymypublic.com

--
        Viktor.

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