The previous commit fixes _(Unknown sender) from being html encoded

src/read_body.php

@@ -394,6 +394,7 @@ function formatEnvheader($mailbox, $passed_id, $passed_ent_id, $message,
     $header = $message->rfc822_header;
     $env = array();
     $env[_("Subject")] = str_replace(" "," ",decodeHeader($header->subject));
+
     $from_name = $header->getAddr_s('from');
     if (!$from_name)
         $from_name = $header->getAddr_s('sender');