Does this allow you to enable this on a per-usergroup basis or does everybody have to use it?

Everybody have to use it, Because v2.00 working with human verification.

I think about v1.00

perfect thanks

i see that u have good skills i like to see another new addon for :
captcha image for attachement download for unregistered users when they are allowed to download but i need to captcha to prevent hot linking

thanks

Well this is totally unusable for me if it requires the user to enter the Human Verification info every time they send a PM.

Uninstalled. If the user types the PM and forgets to enter the code, the whole PM is deleted. I would rather deal with spammer hunting than upset users.

Working OK in 3.7.0, in 3.7.4 PL1 and 3.7.2. Using recaptcha is all OK.
I think is a good work ;)

Is there any chance of upgrading this with two things:

1) Support for quick reply on pms.
2) Change on a usergroup basis this requirement.

Otherwise great work - really helped to stop spam.