SECURITY URLFILT ADD

Usage: SECURITY URLFILT ADD <url>

Adds the specified URL to the filtering list. You can use an * to mask for a domain or you can use a + sign to indicate that you want the entire domain blocked.
*.spam.com will block any domain from spam.com but allow spam.com to be used.
+spam.com will block the entire domain from being used. advert.spam.com will block that specific address.

Example:
/as security urlfilt add spam.webmaster.com

You can use /stats K or /as security urlfilt list to see the number of times each domain has been hit.