--- /dev/null
+--TEST--
+Bug #15320 Charset parameter in Content-Type of mail parts
+--SKIPIF--
+--FILE--
+<?php
+include "Mail/mime.php";
+
+$Mime = new Mail_mime();
+$Mime->addAttachment('testfile', "text/plain", 'file.txt', FALSE, 'base64', 'attachment', 'ISO-8859-1');
+
+$content = $Mime->get();
+//$content = str_replace("\n", '', $content);
+
+if (preg_match('/Content-type:([^\n]+)/i', $content, $matches)) {
+ echo $matches[1];
+}
+
+?>
+--EXPECT--
+text/plain; charset=ISO-8859-1;
+