> There are two characters ('3D') scattered all over the html code.
> I don't know what this means
The is an encoding used on the message, quoted-printable, specifically. This isn't just some random characters inserted into the message.
> I can't display the image embed on the html code. After I read the <img> tag, I
> found out another question. The tag displayed : <img height="100" width="100"
> src="cid:image01.gif@[codes I don't understand]">. Is somebody knows what happen
> to the 'src' attribute? And does it only happen if your retrieve html email from
> Outlook Express?
The cid is a pointer that refers to the inline attachment where the embedded file is located. If you look at the MIME source of the message you'll find that CID in the headers for the image attachment.
MIME mail is very complicated, I suggest you use a prebuilt library for this, unless you are interested in getting to know MIME for academic reasons. One such library is a package I wrote for PEAR called Mail_IMAP, http://pear.php.net/Mail_IMAP
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