Php Mailer Problem

[Beyza]

Hi,

I have a problem. One of my customer used to use php mailer in her
web page. But when i changed something in the system (php packages) ,
it was broken. If she use php-mailer in her system, mails come base64
code. I did not understand why. Do you have any idea?
I am pasting example mail header.

[67.15.68.76]: 55902;
[216.51.232.129]:25;Sat, 29 Jul 2006 05:51:26 -0500
MAIL-FROM:
RCPT-TO:
Received: from blueplane.com.au ([67.15.68.76]:55902)by
ns129.fastdnsservers.com with [XMail 1.22 ESMTP Server]id for from ;
Sat, 29 Jul 2006 05:51:26 -0500
Received: (qmail 9291 invoked by uid 10025);
29 Jul 2006 20:51:23 +1000
Received: from 127.0.0.1 by **** (envelope-from ,
uid 48) with qmail-scanner-2.01st (clamdscan: 0.88.3/1614.
spamassassin: 3.1.3. perlscan: 2.01st. Clear:RC:1(127.0.0.1):.
Processed in 0.139228 secs);
29 Jul 2006 10:51:23 -0000
Date: 29 Jul 2006 20:51:22 +1000
To: ******
Subject: Website Contact Form: test
MIME-Version: 1.0
From: test
Cc: test
X-Mailer: CubeCart Mailer
Content-Type: text/plain;
charset="ISO-8859-1"
Content-Transfer-Encoding: 7bit
Message-ID:
X-Qmail-Scanner-2.01st: renamed duplicate MIME headers
X-Qmail-Scanner-Renamed-Mime-Version: 1.0
X-Qmail-Scanner-2.01st: renamed duplicate MIME headers
X-Qmail-Scanner-Renamed-Content-Type: text/plain;
charset=UTF-8
X-Qmail-Scanner-2.01st: renamed duplicate MIME headers
X-Qmail-Scanner-Renamed-Content-Transfer-Encoding: BASE64

And inside the mail :

TmV4dCBHZW4gQmFieSwgYSBjdXN0b21lciBoYXMgc2VudCB5b3 UgdGhlIGZvbGxvd2luZyBlbnF1
aXJ5OgoKfn5+fn5+fn5+fn5+fn5+fn5+fn5+fn5+fn4KdGVzdA p+fn5+fn5+fn5+fn5+fn5+fn5+
fn5+fn5+fgoKRnJvbTogdGVzdApFbWFpbDogYWhtZXRAbXl0cm FzaG1haWwuY29tCgpJUCBBZGRy
ZXNzOiAyMjAuMjQ1LjE3OC4xMzEK

Thanks,

(sorry for my english)

[Beyza]

My old php version was 5.0 , now 4.3.9.
I had to change because of my other software.. I have to use 4.3.9 but
i did not understand why i receive mails like this