--- /dev/null
+--TEST--
+Bug #10999 Bad Content-ID(cid) format
+--SKIPIF--
+--FILE--
+<?php
+$from='user@from.example.com';
+
+require_once('Mail/mime.php');
+
+$mime=new Mail_mime();
+
+$body='<img src="test.gif"/>';
+
+$mime->setHTMLBody($body);
+$mime->setFrom($from);
+$mime->addHTMLImage('','image/gif', 'test.gif', false);
+$msg=$mime->get();
+
+$header = preg_match('|Content-ID: <[0-9a-fA-F]+@from.example.com>|', $msg);
+if (!$header){
+ print("FAIL:\n");
+ print($msg);
+}else{
+ print("OK");
+}
+--EXPECT--
+OK