[Pkg-exim4-users] Route only outgoing mails to smarthost

[Neil S. Briscoe]

Hi

First, I would change your dc_other_hostnames to :-

dc_other_hostnames='exim.mydomain.com:mydomain.com'

Then run

invoke_rc.d exim4 restart

This will mean that your Exim will accept mail both to its FQDN as well 
as the domain.

Now in /etc/aliases make an entry

a: a at mail.mydomain.com

You should make similar arrangements on mail.mydomain.com such that it 
accepts mail for its FQDN as well as the domain, and set up an alias for 
b pointing to b at exim.mydomain.com

You can continue writing mails to a at mydomain.com and Exim will do the 
work of re-writing and delivering it to the user on mail.mydomain.com, 
likewise they should be able to address you at b at mydomain.com and have 
it delivered to you at b at exim.mydomain.com

Regards
Neil

fn_online at arcor.de wrote:
> Hi,
> 
> I'm having a problem with my exim configuration. I'll try to explain what's going on as good as I can.
> Let's call my server "exim.mydomain.com". There's also the domain's standard mailserver ("mail.mydomain.com").
> Both servers are supposed to handle mails to *@mydomain.com in a certain way. 
> The "mail.mydomain.com" only handles mails to certain addresses (e.g. a at mydomain.com) and routes everything else to my "exim.mydomain.com".
> My "exim.mydomain.com" only handles mails to some other addresses (e.g. b at mydomain.com), every other address is supposed be rejected (e.g. c at mydomain.com).
> All outgoing mail is supposed to be routed to the mailserver (smarthost).
> 
> My config:
> 
> dc_eximconfig_configtype='satellite'
> dc_other_hostnames='mydomain.com'
> dc_local_interfaces=''
> dc_readhost='mydomain.com '
> dc_relay_domains=''
> dc_minimaldns='false'
> dc_relay_nets=''
> dc_smarthost='mail.mydomain.com'
> CFILEMODE='644'
> dc_use_split_config='true'
> dc_hide_mailname='true'
> dc_mailname_in_oh='true'
> dc_localdelivery='mail_spool'
> 
> It's working quite well. I get the mails going to b at mydomain.com and the mails to c at mydomain.com get an undeliverable message (#550 Unrouteable address).
> The problem appears when I try to send mails. Mails to other domains work fine. But mails to a at mydomain.com can't be routed.
> 
>> exim4 -bt a at mydomain.com
> R: system_aliases for a at mydomain.com 
> a@ mydomain.com is undeliverable:
>   Unrouteable address
> 
> I've tried a few things to solve this, like setting mydomain.com as a relay domain or changing the smarthost router to allow local_domain. With these changes the mails to a at mydomain.com get routed, but in both cases the incoming mails to c at mydomain.com will also be routed back to the smarthost (causing a loop between my exim server and the smarthost, because none of them wants to handle this address).
> 
> Is there some way to configure exim to route the outgoing mails to the smarthost, but still reject (undeliverable) the incoming mails to c at mydomain.com?
> 
> Thanks
> Frank
> 
> 
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