OOps the result was a Little bit wrong. It should be:

$fixedheaders[0] = "Subject: Hi you are beutiful";
$fixedheaders[1] = "Content-Type: text/plain;\n\tformat=flowed;\n\tcha
+rset
+=\"iso-8859-1\";\n\treply-type=original";
$fixedheaders[2] = "Return-Path: <example@example.org>";
[download]

Eg with newlines Before the tabs.