Anti-Spam Settings

You can take some measures to prevent spammers, but this also affect the new user experience.

Custom Login Identification Name (Must be english letters)
Customize a name for login page, it'll be more difficult for spammer.
Custom Registration Identification Name (Must be english letters)
Customize a name for registration page, cant be same name with login identification name.
Enable Security Code checked>Login Page checked>Registration Page
Description:
To enable it in blog publishing etc., you'll need to set it in Usergroup.
Use Customized Q&A for Security Check checked>Yes (Recommended) checked>No, use system default graphic security check.
Q&A Settings
Question:   Answer:
Add New Q&A (Answer cant be 0 or empty)
Question:   Answer:
Force Email Verification for New User checked>Yes checked>No
If choose yes, new user must verify email address before post anything.
Unique Email for Verification checked>Yes checked>No
If you choose yes, user must use a unique email, not allowed to use it twice.
Probationary Time for New User hours
New users must wait for some time before post anything.
Force New User to Avatar checked>Yes checked>No
If choose yes, new user must upload avatar before post anything.
Force New User to Add Friends friends.
New user must add some friends before post anything.
Other Measures to Prevent Spam 1. Deactive registration function and only allow invitation registration in Config.
2. Disable unregistered user to access in Privacy.