ayg wrote:

Can you confirm that this string is not in fact blacklisted? This isn't really a bug at all if it matches a blacklist entry. In that case, change the blacklist.

This doesn't really look like a bug, and even if it is, it's not with
SpamBlacklist. Have a look at Wikimedia's InitialiseSettings.php
http://noc.wikimedia.org/conf/InitialiseSettings.php.html. $wgSpamRegex is
set to
'/overflow\s*:\s*auto\s*;\s*height\s*:|<div[^>]*font-size[^>]*font-color:\s*transparent[^>]*>/i'
by default, which would most likely explain why the spam filter catches it.

ayg wrote:

This is a Wikimedia config issue, not an issue with the extension. Probably this is to stop spammers who create giant invisible divs that are links to somewhere. Note that the regex is fragile (height: x; overflow: auto; works). And "font-color" is a little weird, since that's not a valid CSS property.

ok, so it's not a bug in wikimedia, but a problem of of the spam protection text in de.wikipedia.org.
thx for quick answers and sorry for my mistake.

Not a bug, this was added to the blacklist config a couple years ago due to a spambot using that particular formulation over and over and over and over...