Merge pull request #433 from mildred/delivered-to-hdr

Add original Delivered-To header to received messages

core/dovecot/conf/dovecot.conf

@@ -138,7 +138,7 @@ service managesieve {
 plugin {
   sieve = file:~/sieve;active=~/.dovecot.sieve
   sieve_plugins = sieve_extdata sieve_imapsieve sieve_extprograms
-  sieve_global_extensions = +vnd.dovecot.extdata +spamtest +spamtestplus +vnd.dovecot.execute
+  sieve_global_extensions = +vnd.dovecot.extdata +spamtest +spamtestplus +vnd.dovecot.execute +editheader
   sieve_before = /var/lib/dovecot/before.sieve
   sieve_default = /var/lib/dovecot/default.sieve
   sieve_after = /var/lib/dovecot/after.sieve

core/dovecot/sieve/before.sieve

@@ -11,6 +11,14 @@ require "comparator-i;ascii-numeric";
 require "vnd.dovecot.extdata";
 require "vnd.dovecot.execute";
 require "spamtestplus";
+require "editheader";
+require "index";
+
+if header :index 2 :matches "Received" "from * by * for <*>; *"
+{
+  deleteheader "Delivered-To";
+  addheader "Delivered-To" "<${3}>";
+}
 
 if allof (string :is "${extdata.spam_enabled}" "1",
           spamtest :percent :value "gt" :comparator "i;ascii-numeric"  "${extdata.spam_threshold}")