"LISTSERV site administrators' forum" <[log in to unmask]> 
wrote on 01/20/2005 09:18:25 AM:

> 
> Both IE 6 and Firefox 1.0 display raw HTML. Firefox also displays the
> following error message:
> 
>    This XML file does not appear to have any style information
>    associated with it. The document tree is shown below.

IE and Firefox are not RSS readers (at least not without plugins) so they 
will show the raw RSS XML code.  I tried the Mozilla Project's 
Thunderbird, but it only showed the subject of the message, and the URL to 
view the message online.  I would much rather see it download the message, 
or at least the first 10 or 20 lines of the messge so I can decide whether 
I want to see the rest of it.