When I receive mail through my Yahoo account in Zimbra desktop, random news stories are added at the bottom. This does not occur when I read the mail over the web on yahoo.com. They are not advertisements, but news. They show up inside a gray box. Here is an example:
Prank on woman ends just in time
We get a little worried for a gullible passer-by when she's rattled by an "Avatar" star's lie.