SMTPit_SetInlineImage and CSS

[Crooked Arm]

I'm using SMTPit Pro 4.1.12 with FMPA 11v3.

Image references in my HTML code exist in header CSS e.g.:

#header{

	background:url('header.jpg');

	height: 168px;

}

I can set the inline images from container fields, and they do come though with the email as expected. However, they do not display in the webpage that's received (the email client is set to auto-load images).

Because I don't control the HTML template, having it rewritten to use old-style anchor tags isn't as easily done and it ought to be.

Is there any way to make inline images work with CSS? Thanks.