** Description changed:

  [Impact]
  Regression causing breakage of spam filtering for Exim4 users when using 
sa-exim for spamassassin integration.
- 
  
  [Test Case]
  TBD
  
  [Regression Potential]
- Low.  The 'local_scan' function was removed due to concerns it might allow 
rewriting of emails in invalid situations.  However, this risk has been equally 
present in previous exim4 releases thus does not create any new issues, just 
restores behavior to what it has been in the past.
+ Low.
  
- This is the only major change in debian right now (the only other change
- being a README note).
+ The 'local_scan' function was removed due to concerns it might allow
+ rewriting of emails in invalid situations.  However, this risk has been
+ equally present in previous exim4 releases Ubuntu has shipped, thus does
+ not create any new issues, just restores behavior to what it has been in
+ the past.
  
+ This is not a default behavior, so whether it is enabled or not should
+ have no impact on "regular" exim4 users.
  
  [Discussion]
  Upstream dropped support for a 'local_scan' function in 4.92, that sa-exim 
requires; Debian restored support for this capability in 4.92-7, but disco is 
shipping 4.92-4ubuntu1 without the restored support.
  
  The reason upstream dropped the support was out of concern that changes
  in how emails are handled internally will break rewriting in certain
  circumstances.  Unfortunately this breaks compatibility with sa-exim,
  which uses local_scan to do spamassassin checking to reject spam emails
  pre-acceptance.
+ 
+ This SRU is a one-line change to enable HAVE_LOCAL_SCAN in exim4's
+ template configuration file, "EDITME".  Ubuntu has already been carrying
+ the 90_localscan_dlopen.dpatch that implements the necessary
+ functionality, however due to upstream changes it is now necessary to
+ define HAVE_LOCAL_SCAN in the local config (it is off by default).  With
+ this change, the functionality of 90_localscan_dlopen.dpatch will again
+ be effective.
  
  
  [Original Report]
  It seems like after upgrade to 19.04 that exim is not running the local_scan 
function (in my case the sa-exim /usr/lib/exim4/local_scan/sa-exim.so)
  
  So I now don't have the spam-scan I am used to(I have enabled scanning
  by the way of an RCPT_ACL for now)
  
  Hope this can fixed despite sa-exim being very old
  
  Description:    Ubuntu 19.04
  Release:        19.04
  
  exim4-daemon-heavy:
    Installed: 4.92-4ubuntu1
    Candidate: 4.92-4ubuntu1
    Version table:
   *** 4.92-4ubuntu1 500
          500 http://dk.archive.ubuntu.com/ubuntu disco/main amd64 Packages
          100 /var/lib/dpkg/status
  
  I expect to see in /var/log/exim4/mainlog lines like this as I saw before:
  2019-05-12 20:01:54 1hPsnJ-000285-Jj SA: Debug: check succeeded, running spamc
  2019-05-12 20:02:01 1hPsnJ-000285-Jj SA: Action: scanned but message isn't 
spam: score=2.5 required=5.0 (scanned in 7/7 secs | Message-Id: 
duxufv23y44bfkuepz1f4naeoavbh7xtz_es_rsbndc.erur4y-b0k2tn61ykllctsv6z3yzr3hqkm9umv94...@devotestream.icu).
 From <[email protected]> (host=NULL [185.254.236.42]) for <masked email>
  
  I don't see that after upgrading to 19.04 this saturday

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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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