Netscape lets you "attach" Image Files or URL's to your outgoing e-mail!
The image file can actually be any .gif or .jpg format image, and the URL can be "any" Webpage.

From the Netscape Mail Composition Window...,

"Click-on" Attachment:

The following Web Pages will demonstrate how to "Attach a File" and/or "Attach a URL".

FYI...,
You can attach "more that one" Image File or URL, or both!