MIME Mail Problem with Netscape

Hi all, I'm having problem sending MIME Mail using PHP (SMTP) to netscape.net emails, it didn't display the content of html, (although i've filled the content-type with text/html), instead, it display the garbled text. I've tried to encode the message with 7bit and base64 encoding, but those don't work either ;( All other emails (yahoo!, hotmail, etc.) display the emails in html, only netscape that can't interpret it? Is there some way so that netscape understand the emails and displayed it correctly? Am i providing enough information? BTW, I'm using PHP v4.2.3 TIA, Cordially yours, Hendry Johan