[Pkg-exim4-users] Adding a filter to send a copy of some mails, to an external mailbox.

Nick Guerette nick at mosaic-industries.com
Tue Oct 6 21:56:33 UTC 2015

One thing to be aware of is the value of dc_use_split_config in 
/etc/exim4/update-exim4.conf.conf ; if it is 'true', then you need to 
make configuration changes not in /etc/exim4/exim4.conf.template but 
rather in one of the files under /etc/exim4/conf.d/ .  The parameters 
you are setting do not go directly in update-exim4.conf.conf.  See: 

On 10/6/2015 2:07 AM, Rémi Bouhl wrote:
> Hi,
> I have the following configuration, for small business purpose :
> - We have one mail address, "info at ourcompany.fr", and one Debian
> client were we use Icedove to read, process and answer these mails. We
> use our ISP smarthost for sending mails. This Debian client is the
> only computer that can access to the Internet. We have a separate
> Windows LAN.
> - Since we needed to forward some of these mails to some coworkers, I
> have installed exim4 on the Debian client, and created local mailboxes
> : "ls at company-local" and "jm at company-local", and set up Icedove to use
> exim4 as SMTP server.
> This works good : exim4 relays mail for the Internet to our ISP
> smarthost, and stores "@company-local" mails in /var/mail/$user. My
> coworkers can read their local mails using Thunderbird in Windows.
> They can answer the mails, too : they use exim4 as outgoing SMTP
> server. exim4 rewrites the mail ("From" is changed from
> xxx at company-local, to info at ourcompany.fr), then sends it to the ISP
> smarthost.
> What we need is a copy of these mails : For every mail sent by
> "xxx at company-local" to anyone, I need exim4 to send a copy to
> "info at ourcompany.fr", using the ISP smarthost.
> I have created a filter.
> exim4 config is split between exim4.conf.template and update-exim4.conf.conf
> Where do I write the following lines to use my filter ?
> ====
> system_filter = /etc/exim4/filter.txt
> system_filter_pipe_transport = address_pipe
> system_filter_user = Debian-exim
> ====
> I have tried to write these in both exim4.conf.template and
> update-exim4.conf.conf, with no success.
> I have tried in /var/lib/exim4/config.autogenerated, but it gets overwritten.
> Can you point me to the right way of adding my filter ?
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Nick Guerette
Embedded Systems Engineer
Mosaic Industries, Inc.

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