Thanks for your report. I've been able to reproduce the issue and by
digging a bit deeper I found two relevant bugs in Debian [1,2]. Also
relevant is the changelog of the Debian exim4 package [3].
In my understanding this is what happened:
* exim4 4.92 broke the compatibility with sa-exim [4].
* exim4 4.92-5 (Debian package) dropped the patch to enable local_scan and has
been
declared incompatible ("Conflicts:") with sa-exim [3].
* By including api-limitation.patch sa-exim 4.2.1-17 is made compatible with
exim4 4.92.
* exim4 4.92-7 is uploaded to Debian unstable with local_scan enabled again
and the
incompatibility with sa-exim removed.
The newer packages are already in Ubuntu Eoan (currently in development).
This bug can be fixed in Disco by porting those packages back.
[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=925982
[2] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=926952
[3]
https://metadata.ftp-master.debian.org/changelogs//main/e/exim4/exim4_4.92-7_changelog
[4] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=926952#19
** Bug watch added: Debian Bug tracker #925982
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=925982
** Bug watch added: Debian Bug tracker #926952
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=926952
** Also affects: exim4 (Ubuntu Eoan)
Importance: Undecided
Status: New
** Also affects: exim4 (Ubuntu Disco)
Importance: Undecided
Status: New
** Changed in: exim4 (Ubuntu Eoan)
Status: New => Fix Released
** Changed in: exim4 (Ubuntu Disco)
Status: New => Triaged
** Changed in: exim4 (Ubuntu Disco)
Status: Triaged => Fix Committed
** Tags added: server-next
** Changed in: exim4 (Ubuntu Disco)
Status: Fix Committed => Triaged
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https://bugs.launchpad.net/bugs/1829292
Title:
exim4 doesn't run the local_scan function after upgrade to 19.04
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