--- /dev/null
+--TEST--
+Bug #3513 Support of RFC2231 in header fields. (ISO-8859-1)
+--SKIPIF--
+--FILE--
+<?php
+require_once('Mail/mime.php');
+
+$test = "Fóóbær.txt";
+$Mime = new Mail_Mime();
+$Mime->addAttachment('testfile',"text/plain", $test, FALSE, 'base64', 'attachment', 'ISO-8859-1');
+
+$content = $Mime->get();
+$content = str_replace("\n", '', $content);
+
+if (preg_match('/filename([^\s]+)/i', $content, $matches)) {
+ echo $matches[1];
+}
+
+--EXPECT--
+*=ISO-8859-1''F%F3%F3b%E6r.txt;