Trac seems to think I'm a spambot...?

[Herbert Valerio Riedel]

On 2014-04-07 at 11:43:23 +0200, Kyle Van Berendonck wrote:
> I just got flagged as a spambot trying to reply to a ticket too. It did
> give me a captcha option though.

It's surprisingly difficult to discriminate between humans and bots;
I've enabled http://trac.edgewall.org/wiki/SpamFilter and I've tried
tweaking its score weightings, but it still gets some false positives,
and is tends to annoy with reCaptcha interaction (and to my surprise,
even spambots seem to be able to outsmart reCaptcha these days)

Does anyone here have more experience with spam-filtering who could help
set up the Trac spam-filtering?