Update to trixie

mail_system/files/dovecot/sieve/before/README

@@ -0,0 +1,40 @@
+# THIS FILE IS CONTROLLED BY ANSIBLE - DO NOT CHANGE IN DEPLOYMENT!
+
+
+Sieve scripts that will be run before user scripts.
+
+Don't forget to compile the script with
+
+  sievec /etc/dovecot/sieve_before/{name}.sieve
+
+and
+
+  chown mailstore: /etc/dovecot/sieve_before/{name}.*
+
+
+You may use regular Sieve extensions, but also Dovecot-specific Sieve extensions,
+cf. https://wiki2.dovecot.org/Pigeonhole/Sieve .
+
+(Note: We made vnd.dovecot.{pipe,filter,execute} available only in the global context,
+they cannot be used by users.)
+
+
+Example:
+
+require ["vnd.dovecot.filter", "vnd.dovecot.execute", "variables", "envelope", "subaddress"];
+
+if execute :output "out" :pipe "copy_to_matrix" {
+  filter "test" "${out}";
+}
+
+if envelope :matches :detail "to" "*" {
+  set "x" "${1}";
+}
+
+filter "test" "${x}";
+
+if envelope :matches :user "to" "*" {
+  set "y" "${1}";
+}
+
+filter "test" "${y}";