Set custom iPhone CSS signatures

Well, I tried this css signature with an image encoded in data URLs. The image rendered perfectly with Apple mail app and with the iphone mail app, but not when I viewed my test email on google mail using firefox!
What gives?

David F. Bills link doesn't work anymore, I guess he got to many hits...
Here is another link that works!
http://limitededitioniphone.com/guide-custom-iphone-css-signatures/

I've noticed that anomalia too.
If I send codded signature to Yahoo or Gmail, the image is missing. Any other mailservice sees them, but these two large fail. Any help or at least a reason why is that?

Hi. I tried this. It looks beautiful on my iPhone and all but I have a few problems.
The sent messages folder of the account that I sent the message with the signature will show only the text from the signature.
The picture does not show itself in the message as being sent with the rest of the signature.
When I check the webmail of the accounts, for example yahoo.com, for some reason, it manages to keep the formatting of the text, like my name in bold, my phone number in bold and the rest of the text in a different font and font size. It even has the two lines to the top and bottom of the signature. However, the picture is not there.
Then when I check the messages using the Mail application on my powerbook, Mail shows the same message with the image and the formated text. Erica, have you noticed this? Has anyone else who tried this gotten this anomaly? If you want, I can sent you the code that I used to do mine. and I can send you the picture data for the image that I used in the same base64.
I can be reached at kofster at yahoo dot com.

This rules. I set the CSS signature on my phone, its insanely cool, stylish, and elegant AND it has an iPhone icon in it!... Then, I used the same concept to create the same signature for my computer and replaced the iPhone icon with a MacBook icon. Now when i send an email from my phone it will still indicate it was send from my iPhone, and email sent from my macbook will be indicated accordingly as well.. THIS TRICK RULES! one of my favorites thus far!

Anybody know how to achieve this on a Windows machine? I.e. what to use instead of PropertyListEditor?

Hey Erica, if you get a spare minute figure out a hack that will let me attach a file/picture etc to an e-mail once I already have the e-mail started. It's driving me crazy that I have not way of attaching anything after clicking on a mailto: link etc.

is there an easy way to do it on windows?

Erica, what are your plans come Feb if Apple doesn't sanction AppTapp?

I swear I thought that the CSS was about the band CSS. HAHAHA