A few months ago we opened-up our JIRA instance for anonymous access so that our customers can comment on and create issues without having to log-in into JIRA (reason for that being that we only have a 25 users license and cannot afford an unlimited user license).
Unfortunately yesterday a spambot detected our page and created > 1.500 spam comments over night. The only solution I saw was to revoke the permission for anonymous comments again.
Isn't there another possibility to protect against spammers? Captcha system, moderated comments, spam-detection,...