This is a list where you put all the userid of the members/admins/super-mod who do not want to receive the email alerts on each Report or Infraction made on the forum.
This is a simple whitelist of a sort, because you may not want all the moderators to receive these reports emails... (i personally hate to have these emails, but some like them)
in the Admincp >> vBulletin Options >>
User Infractions
Engine Updated: added the choice to send the email to different types of persons...
Official Source:
http://vbenhancer.com/free-features-...s-emails/3268/