diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -2280,6 +2280,7 @@
     'PhabricatorConpherenceColumnMinimizeSetting' => 'applications/settings/setting/PhabricatorConpherenceColumnMinimizeSetting.php',
     'PhabricatorConpherenceColumnVisibleSetting' => 'applications/settings/setting/PhabricatorConpherenceColumnVisibleSetting.php',
     'PhabricatorConpherenceNotificationsSetting' => 'applications/settings/setting/PhabricatorConpherenceNotificationsSetting.php',
+    'PhabricatorConpherenceParticipantSetting' => 'applications/settings/setting/PhabricatorConpherenceParticipantSetting.php',
     'PhabricatorConpherencePreferencesSettingsPanel' => 'applications/settings/panel/PhabricatorConpherencePreferencesSettingsPanel.php',
     'PhabricatorConpherenceThreadPHIDType' => 'applications/conpherence/phid/PhabricatorConpherenceThreadPHIDType.php',
     'PhabricatorConpherenceWidgetVisibleSetting' => 'applications/settings/setting/PhabricatorConpherenceWidgetVisibleSetting.php',
@@ -7142,6 +7143,7 @@
     'PhabricatorConpherenceColumnMinimizeSetting' => 'PhabricatorInternalSetting',
     'PhabricatorConpherenceColumnVisibleSetting' => 'PhabricatorInternalSetting',
     'PhabricatorConpherenceNotificationsSetting' => 'PhabricatorSelectSetting',
+    'PhabricatorConpherenceParticipantSetting' => 'PhabricatorSelectSetting',
     'PhabricatorConpherencePreferencesSettingsPanel' => 'PhabricatorEditEngineSettingsPanel',
     'PhabricatorConpherenceThreadPHIDType' => 'PhabricatorPHIDType',
     'PhabricatorConpherenceWidgetVisibleSetting' => 'PhabricatorInternalSetting',
diff --git a/src/applications/conpherence/editor/ConpherenceEditor.php b/src/applications/conpherence/editor/ConpherenceEditor.php
--- a/src/applications/conpherence/editor/ConpherenceEditor.php
+++ b/src/applications/conpherence/editor/ConpherenceEditor.php
@@ -478,6 +478,16 @@
       return $to_phids;
     }
 
+    switch ($xaction->getTransactionType()) {
+      case ConpherenceTransaction::TYPE_PARTICIPANTS:
+        $old_map = array_fuse($xaction->getOldValue());
+        $new_map = array_fuse($xaction->getNewValue());
+
+        $add = array_keys(array_diff_key($new_map, $old_map));
+        $rem = array_keys(array_diff_key($old_map, $new_map));
+      break;
+    }
+
     $participant_phids = mpull($participants, 'getParticipantPHID');
 
     $users = id(new PhabricatorPeopleQuery())
@@ -487,27 +497,40 @@
       ->execute();
     $users = mpull($users, null, 'getPHID');
 
-    $notification_key = PhabricatorConpherenceNotificationsSetting::SETTINGKEY;
-    $notification_email =
+    $new_message_key = PhabricatorConpherenceNotificationsSetting::SETTINGKEY;
+    $new_message_email =
       PhabricatorConpherenceNotificationsSetting::VALUE_CONPHERENCE_EMAIL;
 
+    $status_key = PhabricatorConpherenceParticipantSetting::SETTINGKEY;
+    $status_email =
+      PhabricatorConpherenceParticipantSetting::VALUE_CONPHERENCE_PART_EMAIL;
+
     foreach ($participants as $phid => $participant) {
       $user = idx($users, $phid);
       if ($user) {
-        $default = $user->getUserSetting($notification_key);
+        $default = $user->getUserSetting($new_message_key);
+        $default_status = $user->getUserSetting($status_key);
       } else {
-        $default = $notification_email;
+        $default = $new_message_email;
       }
 
       $settings = $participant->getSettings();
       $notifications = idx($settings, 'notifications', $default);
 
-      if ($notifications == $notification_email) {
+      if ($notifications == $new_message_email) {
         $to_phids[] = $phid;
       }
+
+      $joined = (($add === array($phid)) && !$rem);
+      $left = (($rem === array($phid)) && !$add);
+
+      if (($left || $joined) && ($default_status == $status_email)) {
+        $to_phids[] = $phid;
+      }
+
     }
 
-    return $to_phids;
+    return array_unique($to_phids);
   }
 
   protected function getMailCC(PhabricatorLiskDAO $object) {
diff --git a/src/applications/settings/setting/PhabricatorConpherenceNotificationsSetting.php b/src/applications/settings/setting/PhabricatorConpherenceNotificationsSetting.php
--- a/src/applications/settings/setting/PhabricatorConpherenceNotificationsSetting.php
+++ b/src/applications/settings/setting/PhabricatorConpherenceNotificationsSetting.php
@@ -9,7 +9,7 @@
   const VALUE_CONPHERENCE_NOTIFY = '1';
 
   public function getSettingName() {
-    return pht('Conpherence Notifications');
+    return pht('New Message');
   }
 
   public function getSettingPanelKey() {
@@ -18,7 +18,7 @@
 
   protected function getControlInstructions() {
     return pht(
-      'Choose the default notification behavior for Conpherence rooms.');
+      'Choose the default new message behavior for Conpherence rooms.');
   }
 
   protected function isEnabledForViewer(PhabricatorUser $viewer) {
@@ -28,7 +28,7 @@
   }
 
   public function getSettingDefaultValue() {
-    return self::VALUE_CONPHERENCE_EMAIL;
+    return self::VALUE_CONPHERENCE_NOTIFY;
   }
 
   protected function getSelectOptions() {
diff --git a/src/applications/settings/setting/PhabricatorConpherenceNotificationsSetting.php b/src/applications/settings/setting/PhabricatorConpherenceParticipantSetting.php
copy from src/applications/settings/setting/PhabricatorConpherenceNotificationsSetting.php
copy to src/applications/settings/setting/PhabricatorConpherenceParticipantSetting.php
--- a/src/applications/settings/setting/PhabricatorConpherenceNotificationsSetting.php
+++ b/src/applications/settings/setting/PhabricatorConpherenceParticipantSetting.php
@@ -1,15 +1,15 @@
 <?php
 
-final class PhabricatorConpherenceNotificationsSetting
+final class PhabricatorConpherenceParticipantSetting
   extends PhabricatorSelectSetting {
 
-  const SETTINGKEY = 'conph-notifications';
+  const SETTINGKEY = 'conph-participant-notifications';
 
-  const VALUE_CONPHERENCE_EMAIL = '0';
-  const VALUE_CONPHERENCE_NOTIFY = '1';
+  const VALUE_CONPHERENCE_PART_EMAIL = '0';
+  const VALUE_CONPHERENCE_PART_NOTIFY = '1';
 
   public function getSettingName() {
-    return pht('Conpherence Notifications');
+    return pht('Participation Status');
   }
 
   public function getSettingPanelKey() {
@@ -18,7 +18,8 @@
 
   protected function getControlInstructions() {
     return pht(
-      'Choose the default notification behavior for Conpherence rooms.');
+      'Choose the default notification behavior for being added or removed '.
+      'from Conpherence rooms.');
   }
 
   protected function isEnabledForViewer(PhabricatorUser $viewer) {
@@ -28,7 +29,7 @@
   }
 
   public function getSettingDefaultValue() {
-    return self::VALUE_CONPHERENCE_EMAIL;
+    return self::VALUE_CONPHERENCE_PART_EMAIL;
   }
 
   protected function getSelectOptions() {
@@ -42,8 +43,8 @@
 
   private static function getOptionsMap() {
     return array(
-      self::VALUE_CONPHERENCE_EMAIL => pht('Send Email'),
-      self::VALUE_CONPHERENCE_NOTIFY => pht('Send Notifications'),
+      self::VALUE_CONPHERENCE_PART_EMAIL => pht('Send Email'),
+      self::VALUE_CONPHERENCE_PART_NOTIFY => pht('Send Notification'),
     );
   }