--- /dev/null
+--TEST--
+Bug #16539 Headers longer than 998 characters
+--SKIPIF--
+--FILE--
+<?php
+include("Mail/mime.php");
+
+$headers['From'] = 'aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffgggggggggghhhhhhhhhh';
+# over than 76 chars
+$mime = new Mail_mime();
+$hdrs = $mime->headers($headers);
+print_r($hdrs['From']);
+?>
+--EXPECT--
+aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffgggggggggghhhhhhhhhh