Sortables captcha upgrade

[Tolaso J Kos]

Dear guests,

we would like to inform you that we have updated the Sortables Captcha extension due to increase volume of spams. We noticed that in the last days alone $3$ spambots managed to bypass our security measures and create an account here on mathimatikoi.org. As if that weren't enough, they were even able to post.

All spam posts have been deleted by the moderation team.

In any case, we are monitoring the situation and we will intervene if needed again. If things get out of hand, we'll take additional measures (e.g moderate first post, etc.)

Thank you,

the administration team.