EDIT: I just found that in this wiki under <http://ikiwiki.info/bugs/done/> the entry "mailto: links not properly generated in rss/atom feeds" also doesn't have a hyperlink - at least it's not a problem with my config only ;-)
-[[madduck]]: I can confirm this on my own wiki.
+[[madduck]]: I traced this down to `htmlscrubber`. If disabled, it works. If enabled, then `$safe_url_regexp` determines the URL unsafe because of the colon and hence removes the `src` attribute.