exim4: how to add an address as BCC to all the outgoing emails?

Dr. Gianluigi Zane Zanettini

12/6/23, 1:52 PM

I'm working on an Ubuntu 20.04 web server where exim4 is used to send emails from the PHP application running on it.

Due to diagnostic and archival needs, I need to configure exim4 to automatically BCC an additional address to ALL the outgoing emails.

TO be cleared: all the original recipients of the outgoing email must remain the same. I just need to add my additional [email protected] address to the list (as BCC).

My exim4 skill are near-zero (I generally use postfix), so please behave ;-).

I tried to follow along this post, but nothing happens. I don't have a /etc/exim/exim.conf (most likely due to the "split configuration" mode of exim4) so I created a new file in /etc/exim4/conf.d/main/nano 95_zane with this:

system_filter = /etc/exim4/exim.filter

Then I created /etc/exim4/exim.filter:

if first_delivery
   and ("$h_to:, $h_cc:, $h_bcc" not contains "example.com")
   and ("$h_from:" not contains "example.com")
then
   unseen deliver "[email protected]"
endif

I restarted exim4 and re-tried, but nothing happens: the intended recipient gets the message, but my additional address is not BBC'ed.

Thanks for your help!

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Dr. Gianluigi Zane Zanettini

12/6/23, 2:32 PM

Got it! I just had to add system_filter = /etc/exim4/exim.filter directly a the top of /etc/exim4/exim4.conf.template and now it works as expected.

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