--- mimemail.module.orig
+++ mimemail.module
@@ -320,5 +320,5 @@
     if (file_exists($style)) $css .= file_get_contents($style);
   }
 
-  $variables['css'] = str_replace(' ','', str_replace("\n", '', $css));
+  $variables['css'] = preg_replace('/ +/i', ' ', $css);
 }