Email with special characters to Tumblr - php

Question

I'm using a PHP script to email a posting to Tumblr and Posterous. For Posterous special characters are showing up in the posting but for Tumblr it don't.
(In general Tumblr does support special character - I tried it out with emailing from Gmail)
So what could be the problem?
Here my PHP header:
$headers .= "MIME-Version: 1.0\r\n"
."Content-Type: multipart/alternative; boundary=\"PHP-mixed-$bound_text\"\r\n";
$message = "--PHP-mixed-$bound_text\r\n"
."Content-Type: multipart/related; type=\"text/html\"; boundary=PHP-mixed2-$bound_text\r\n\r\n"
."--PHP-mixed2-$bound_text\r\n"
."Content-Type: text/html; charset=\"utf-8\"\r\n"
."Content-Transfer-Encoding: 7bit\r\n\r\n";
I already tried several charsets and Content-Transfer-Encoding combinations without any different result.
Any ideas are welcome.
Michael

Answer 1

I looked into how my GMail account sent it and found out it used windows-1252 for the charset and the text is base64 encoded (this may not be case in using other GMail accounts). The email I sent below was successfully posted by tumblr and I used the function utf8_decode to generate the correct base64 string.
$data = wordwrap(base64_encode(utf8_decode($stringWithSpecialCharacters)));
The raw email message is below:
To: myuploademail#tumblr.com
Subject: tumblr post from sudocode
from: omime class <script#sudocode.net>
MIME-Version: 1.0
Content-type: multipart/alternative;
boundary=omime_1308940625_c0d4e36fd504619028804e8b23ceb12a
--omime_1308940625_c0d4e36fd504619028804e8b23ceb12a
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: base64
38TW+eLq7vT76//mP9nCys4=
--omime_1308940625_c0d4e36fd504619028804e8b23ceb12a
Content-Type: text/html; charset=windows-1252
Content-Transfer-Encoding: base64
38TW+eLq7vT76//mP9nCys4=
--omime_1308940625_c0d4e36fd504619028804e8b23ceb12a--
I used my omime class to send the email and here's the code I used:
$email = new omime('alternative');
$email->attachText('ßÄÖùâêîôûëÿæœÙÂÊÎ');
$email->attachHTML('ßÄÖùâêîôûëÿæœÙÂÊÎ');
$email->send('mysecretuploademail#tumblr.com', 'test tumblr post', 'from: omime class <script#sudocode.net>');