Index: src/applications/differential/editor/DifferentialTransactionEditor.php
===================================================================
--- src/applications/differential/editor/DifferentialTransactionEditor.php
+++ src/applications/differential/editor/DifferentialTransactionEditor.php
@@ -364,6 +364,10 @@
 
         $diff->setRevisionID($object->getID());
         $diff->save();
+
+        $object->setLineCount($diff->getLineCount());
+        $object->setRepositoryPHID($diff->getRepositoryPHID());
+
         return;
     }
 
Index: src/applications/differential/storage/DifferentialTransaction.php
===================================================================
--- src/applications/differential/storage/DifferentialTransaction.php
+++ src/applications/differential/storage/DifferentialTransaction.php
@@ -87,6 +87,69 @@
     return $phids;
   }
 
+  public function getActionName() {
+    switch ($this->getTransactionType()) {
+      case self::TYPE_INLINE:
+        return pht('Commented On');
+      case self::TYPE_UPDATE:
+        return pht('Updated');
+      case self::TYPE_ACTION:
+        $map = array(
+          DifferentialAction::ACTION_ACCEPT => pht('Accepted'),
+          DifferentialAction::ACTION_REJECT => pht('Requested Changes To'),
+          DifferentialAction::ACTION_RETHINK => pht('Planned Changes To'),
+          DifferentialAction::ACTION_ABANDON => pht('Abandoned'),
+          DifferentialAction::ACTION_CLOSE => pht('Closed'),
+          DifferentialAction::ACTION_REQUEST => pht('Requested A Review Of'),
+          DifferentialAction::ACTION_RESIGN => pht('Resigned From'),
+          DifferentialAction::ACTION_ADDREVIEWERS => pht('Added Reviewers'),
+          DifferentialAction::ACTION_CLAIM => pht('Commandeered'),
+          DifferentialAction::ACTION_REOPEN => pht('Reopened'),
+        );
+        $name = idx($map, $this->getNewValue());
+        if ($name !== null) {
+          return $name;
+        }
+        break;
+    }
+
+    return parent::getActionName();
+  }
+
+  public function getMailTags() {
+    $tags = array();
+
+    switch ($this->getTransactionType()) {
+      case PhabricatorTransactions::TYPE_SUBSCRIBERS;
+        $tags[] = MetaMTANotificationType::TYPE_DIFFERENTIAL_CC;
+        break;
+      case self::TYPE_ACTION:
+        switch ($this->getNewValue()) {
+          case DifferentialAction::ACTION_CLOSE:
+            $tags[] = MetaMTANotificationType::TYPE_DIFFERENTIAL_CLOSED;
+            break;
+        }
+        break;
+      case PhabricatorTransactions::TYPE_EDGE:
+        switch ($this->getMetadataValue('edge:type')) {
+          case PhabricatorEdgeConfig::TYPE_DREV_HAS_REVIEWER:
+            $tags[] = MetaMTANotificationType::TYPE_DIFFERENTIAL_REVIEWERS;
+            break;
+        }
+        break;
+      case PhabricatorTransactions::TYPE_COMMENT:
+      case self::TYPE_INLINE:
+        $tags[] = MetaMTANotificationType::TYPE_DIFFERENTIAL_COMMENT;
+        break;
+    }
+
+    if (!$tags) {
+      $tags[] = MetaMTANotificationType::TYPE_DIFFERENTIAL_OTHER;
+    }
+
+    return $tags;
+  }
+
   public function getTitle() {
     $author_phid = $this->getAuthorPHID();
     $author_handle = $this->renderHandleLink($author_phid);
Index: src/applications/metamta/adapter/PhabricatorMailImplementationMailgunAdapter.php
===================================================================
--- src/applications/metamta/adapter/PhabricatorMailImplementationMailgunAdapter.php
+++ src/applications/metamta/adapter/PhabricatorMailImplementationMailgunAdapter.php
@@ -99,6 +99,11 @@
       $params['cc'] = $this->params['ccs'];
     }
 
+    foreach (idx($this->params, 'headers', array()) as $header) {
+      list($name, $value) = $header;
+      $params['h:'.$name] = $value;
+    }
+
     $future = new HTTPSFuture(
       "https://api:{$key}@api.mailgun.net/v2/{$domain}/messages",
       $params);