On 2025-11-22 Thomas Krichel via Exim-users <[email protected]> wrote:
>   Andreas Metzler via Exim-users writes

> > exim 4.99 features big changes regarding loadable modules (See NewStuff
> > 4!). I suspect this broke the patch for loading local_scan as a
> > loadable module.

>   Thank you for getting back to me. 

>   In March 2019, we had a different incident with local_scan. At
>   the time, it looked like it disappeared, and I (and others) would
>   have to give up on sa-exim, but it reappeared after a few weeks.

>   local_scan is still listed as as facility in the documentation.
>   I am not sure what "the patch" is. 

Hello Thomas,

local_scan is a native exim feature
https://www.exim.org/exim-html-current/doc/html/spec_html/ch-adding_a_local_scan_function_to_exim.html
However the "official" version is compiled into exim, whereas sa-exim is
built as dynamic object and dlopened by exim. There is an external patch
to exim to allow dlopened local_scan. The latest semi-official one is
shipped with sa-exim https://salsa.debian.org/holmgren/sa-exim however
it does not apply cleanly anymore, you can find the version used by
Debian here 
https://salsa.debian.org/exim-team/exim4/-/blob/master/debian/patches/90_localscan_dlopen.dpatch?ref_type=heads
Fedora has a slightly different version
https://src.fedoraproject.org/rpms/exim/blob/rawhide/f/exim-4.97-dlopen-localscan.patch
but there should not be a substantial difference.

>   Can I help in any way? Is this the right list to write to? I joined
>   [email protected].

I think discussion here should be fine, while this is about an external
patch it is not a Debian-specific one. I hope will tell me if I am
wrong.

cu Andreas

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