On Tue, Aug 09, 2016 at 04:14:49PM +0200, hw wrote:
> with several domains declared as local domains, users can
> send and receive messages with sender addresses the domain
> part of which is any of the local domains.

 There are no built-in restrictions for the sender's domain part:
 by default senders can eject e-mails from arbitrary envelope
 addresses and with arbitrary headers.

> Unfortunately,
> when looking at the headers, the recipient can always see
> from which domain the message was actually sent because of
> headers like Received: and Sender:, and the envelope information.

 May be you mean these headers exibit information about mail host.
 Host may be declared local for several domains, that's true.

> Is there a way to make it so that the recipient of a message
> sent from <[email protected]> cannot figure out that the message
> was actually sent from <[email protected]> when the host exim
> runs on has a primary hostname like mx.domain-a.net?

 You may delete some headers in Exim routers or transports.
 Look for headers_remove options in documentation (ch. 47 p. 17).

> Do I need to set up another email server for this?

 Yes. You may also run several Exim instances on the same host,
 however, this is slightly tricky in configuration.
-- 
 Eugene Berdnikov

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