diff --git a/src/infrastructure/markup/interpreter/PhabricatorRemarkupCowsayBlockInterpreter.php b/src/infrastructure/markup/interpreter/PhabricatorRemarkupCowsayBlockInterpreter.php
--- a/src/infrastructure/markup/interpreter/PhabricatorRemarkupCowsayBlockInterpreter.php
+++ b/src/infrastructure/markup/interpreter/PhabricatorRemarkupCowsayBlockInterpreter.php
@@ -28,10 +28,16 @@
       ->setText($content)
       ->renderCow();
 
-    if ($this->getEngine()->isTextMode()) {
+    $engine = $this->getEngine();
+
+    if ($engine->isTextMode()) {
       return $result;
     }
 
+    if ($engine->isHTMLMailMode()) {
+      return phutil_tag('pre', array(), $result);
+    }
+
     return phutil_tag(
       'div',
       array(
diff --git a/src/infrastructure/markup/interpreter/PhabricatorRemarkupFigletBlockInterpreter.php b/src/infrastructure/markup/interpreter/PhabricatorRemarkupFigletBlockInterpreter.php
--- a/src/infrastructure/markup/interpreter/PhabricatorRemarkupFigletBlockInterpreter.php
+++ b/src/infrastructure/markup/interpreter/PhabricatorRemarkupFigletBlockInterpreter.php
@@ -27,10 +27,16 @@
 
     $result = $figlet->lineEcho($content);
 
-    if ($this->getEngine()->isTextMode()) {
+    $engine = $this->getEngine();
+
+    if ($engine->isTextMode()) {
       return $result;
     }
 
+    if ($engine->isHTMLMailMode()) {
+      return phutil_tag('pre', array(), $result);
+    }
+
     return phutil_tag(
       'div',
       array(