I was thinking of submitting this as a bug, but I thought I might ask first here in the forums. As the subject hints, when word wrap is active, dashes ( - ) will be treated like word separators. Besides space, this seems to be the only other character that is treated like a word boundary. The problem is that this will split some URLs that contain dashes (like blog posts, the link to which usually contains the post's title with dashes replacing spaces). Is there any way to work around this issue?

I'm using KMail 1.13.0 and KDE 4.4.0 (from Archlinux repositories)

You may wish to file a bug.

I will do so, and post here the link, but in the meantime, have you been able to confirm the problem?

Alas, it seems there already was a bug for this (that I somehow missed when first searched for it...). Anyway, here's the link: https://bugs.kde.org/show_bug.cgi?id=209030