[Kroupware] Forwarding mail to unknown recipient to another server

[Paul Gargan]

Hi Ellis,

Ellis Whitehead wrote:
> Hello Paul,
> 
> Thanks for the info. ;)  I'm afraid it didn't work though -- came back with
> the following response:

>  <axel.richter at example.de>:
> host /kolab/var/kolab/lmtp[/kolab/var/kolab/lmtp]
>      said: 550-Mailbox unknown.  Either there is no mailbox associated with
> this
>      550-name or you do not have authorization to see it. 550 5.1.1 User
> unknown
>      (in reply to RCPT TO command)

This looks like your Kolab box is trying to handle mail for axel.richter 
itself (an unknown local account), instead of passing it off to your 
primary email server like you want it to.

> We're using a somewhat older version of Kolab: from mid-September.  The
> "kolabconf" file you mentioned doesn't exist in that version, but a restart
> of kolab did appropriately copy main.cf.template
> to /kolab/etc/postfix/main.cf.
> 
>         mail /kolab # grep luser etc/postfix/main.cf
>         luser_relay = $user at mail.arcor-ip.de
> 
>         mail /kolab # grep local_recipient_maps etc/postfix/main.cf
>         local_recipient_maps =

This *looks* correct. Out of interest, what version of Postfix are you 
using ("/kolab/bin/rpm -qi postfix")

Note too that sample documentation explaining most of the possible Kolab 
configuration parameters is in /kolab/etc/postfix/sample

Hmmm. Further reading suggests that "mailbox_transport" (which is set to 
"lmtp" under Kolab) takes precedence over "luser_relay". So apologies 
for sending you down the wrong path with my initial suggestion!

Another idea:
In main.cf.template, set:

	transport_maps = hash:/etc/postfix/transport

Then edit the /kolab/etc/kolab/transport.template file.
Documentation available with "man 5 transport".
You should be able to add lines like:

	user1 at example.com	smtp:[ip.address.of.other.machine]
	user2 at example.com	smtp:[ip.address.of.other.machine]

The idea is to tell Postfix to deliver mail for the non-local accounts 
via SMTP to your primary server. The [square brackets] tell Postfix 
*not* to do an MX lookup of the far machine, which might resolve back to 
the Kolab server, depending on how you have your systems configured.

Of course, explicitly listing all remote users in this manner could get 
a little tedious if there are many such users :-/

> However, I need to send the emails on to another server without changing the
> email address -- if it gets changed to axel.richter at mail.arcor-ip.de, then
> the arcor server won't know which company its for.

If the above works (test it :) the entire mail - including the original 
envelope details - should be fed via SMTP to the remtoe machine.

> Any ideas?

The Postfix-users mailing list ( http://www.postfix.org/lists.html ) is 
full of people who know how Postfix works in-depth. Perhaps try a polite 
question there if you're still stuck?

Regards,
Paul.