diff --git a/src/deb/for-download/tools/patches/exim_forwarding.patch b/src/deb/for-download/tools/patches/exim_forwarding.patch
new file mode 100644
index 00000000..78b7ef69
--- /dev/null
+++ b/src/deb/for-download/tools/patches/exim_forwarding.patch
@@ -0,0 +1,14 @@
+--- old	2023-03-23 14:17:42.536656160 +0100
++++ new	2023-03-24 23:07:08.186018906 +0100
+@@ -140,6 +140,11 @@
+ 
+   warn    set acl_m3    = no
+   
++  warn    !authenticated = *
++          hosts          = !+relay_from_hosts
++          condition     = ${lookup{$local_part@$domain}lsearch{/etc/exim4/domains/$domain/aliases}{true}{false}}
++          set acl_m3    = yes
++
+   deny    message       = Restricted characters in address
+           domains       = +local_domains
+           local_parts   = ^[.] : ^.*[@%!/|]