From 59db2826247cb2ecf8683fa31ab367a780d8583a Mon Sep 17 00:00:00 2001
From: epriestley <git@epriestley.com>
Date: Mon, 23 Jul 2012 09:23:54 -0700
Subject: [PATCH] Fix an issue with email "Re:" prefix

Summary: See detailed discussion in T1543.

Test Plan:
  - Enabled multiplexing.
  - Set user A to "enable Re".
  - Created a task owned by user B with user A cc'd.
  - Verified A got no "Re:" before this patch.
  - Applied patch.
  - Verified A got "Re:" after this patch.

Reviewers: nh, btrahan, vrana

Reviewed By: nh

CC: aran

Maniphest Tasks: T1543

Differential Revision: https://secure.phabricator.com/D3031
---
 .../storage/PhabricatorMetaMTAMail.php        | 23 ++++++++++++++-----
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/src/applications/metamta/storage/PhabricatorMetaMTAMail.php b/src/applications/metamta/storage/PhabricatorMetaMTAMail.php
index 5dae327158..b78aa1e47b 100644
--- a/src/applications/metamta/storage/PhabricatorMetaMTAMail.php
+++ b/src/applications/metamta/storage/PhabricatorMetaMTAMail.php
@@ -448,12 +448,23 @@ final class PhabricatorMetaMTAMail extends PhabricatorMetaMTADAO {
 
             $prefs = null;
             if ($use_prefs) {
-              $to = idx($params, 'to', array());
-              $user = id(new PhabricatorUser())->loadOneWhere(
-                'phid = %s',
-                head($to));
-              if ($user) {
-                $prefs = $user->loadPreferences();
+
+              // If multiplexing is enabled, some recipients will be in "Cc"
+              // rather than "To". We'll move them to "To" later (or supply a
+              // dummy "To") but need to look for the recipient in either the
+              // "To" or "Cc" fields here.
+              $target_phid = head(idx($params, 'to', array()));
+              if (!$target_phid) {
+                $target_phid = head(idx($params, 'cc', array()));
+              }
+
+              if ($target_phid) {
+                $user = id(new PhabricatorUser())->loadOneWhere(
+                  'phid = %s',
+                  $target_phid);
+                if ($user) {
+                  $prefs = $user->loadPreferences();
+                }
               }
             }