Viewing the page
http://www.gnupg.org/(es)/documentation/mailing-lists.html
(it also occurs in (en) page)
The text is cutted just below the line
"You can subscribe to these lists via web or by sending an e-mail:"
and no more text appears.
Problem can be the <samp> tag, because in the source code the complete text appears.
Unknown
Paged is displayed as expected with email addresse framed in a grayed box.
Could you check this out and close the bug if it is the case?
The correct display depends on the browser version. The page
is correctly shown in the more modern browsers, but isn't in
older browsers. Thus, page is not world-wide accesible, but
you need a potent machine to support a big OS needed by a
recent browser.