Version: (using KDE KDE 3.5.7) Let's say you have link in mail: http://newsletters.sdmediagroup.com/cgi-bin4/DM/y/hBD4b0Hlz1Z0TKJ0FZzX0Ed when you choose open url, if error occurs you will get only this; Unknown host www.ddj.com Not much, right? Instead of showing just host name (which does not help) show full URL, so user could select and copy it. ( I have strange feeling I posted such report some time ago but I cannot find it, thus I assume it is only my imagination ).
In 4.3.1 you get a rather elaborate HTML page describing the problem and possible solutions.
*** Bug 150870 has been marked as a duplicate of this bug. ***