Deal with aliases correctly with no mailboxes dir

CHANGELOG

 CHANGELOG
 ---------
 
+2021-09-21
+  sympl-mail:
+    * Deal with aliases correctly when no mailboxes directory exists
+
 2021-08-19
   all:
     * Debian Bullseye Release
-  core:
+  sympl-core:
     * Updates to MOTD and banners
 
 2021-08-18

mail/debian/changelog

+sympl-mail (11.20210921.1) stable; urgency=medium
+
+  * Deal with mail correctly when no mailboxes directory exists, fixes #317
+
+ -- Paul Cammish <sympl@kelduum.net>  Tue, 21 Sep 2021 13:58:00 +0100
+ 
 sympl-mail (11.20210818.1) stable; urgency=medium
 
   * Debian Bullseye Release

mail/exim4/sympl.d/20-routers/22-vhost-forward

@@ -5,7 +5,7 @@ vhost_forward:
   domains = +vhost_domains
   local_part_suffix = +*
   local_part_suffix_optional
-  local_parts = ${lookup{$local_part}dsearch{VHOST_DIR/$domain_data/VHOST_MAILBOX_DIR}}
+  local_parts = ${if exists {VHOST_DIR/$domain/VHOST_MAILBOX_DIR}{${lookup{$local_part}dsearch{VHOST_DIR/$domain_data/VHOST_MAILBOX_DIR}}}{}}
   # Make sure the files exists to avoid awkward failures
   condition  = ${if exists{VHOST_DIR/$domain/VHOST_MAILBOX_DIR/$local_part/forward}}
   file  = VHOST_DIR/$domain_data/VHOST_MAILBOX_DIR/$local_part_data/forward

mail/exim4/sympl.d/20-routers/24-vhost-mailbox

@@ -6,7 +6,7 @@ vhost_mailbox:
   local_part_suffix = +*
   local_part_suffix_optional
   # Define local_parts, which fills in local_part_data
-  local_parts = dsearch;VHOST_DIR/$domain_data/VHOST_MAILBOX_DIR
+  local_parts = ${if exists {VHOST_DIR/$domain/VHOST_MAILBOX_DIR}{dsearch;VHOST_DIR/$domain_data/VHOST_MAILBOX_DIR}{}}
   condition  = ${if exists{VHOST_DIR/$domain/VHOST_MAILBOX_DIR/$local_part/}}
   # Set the home directory for any routers/transports.
   router_home_directory    = VHOST_DIR/$domain_data/VHOST_MAILBOX_DIR/$local_part_data