ACCEPT allows you to control who can send you a NOTICE or PRIVMSG
while you have user mode +g enabled.
+Accepted users can also message you if you have user mode +R
+enabled, even if they are not logged in with services.
+
For +g: /QUOTE ACCEPT <nick> -- Add a permitted nickname
/QUOTE ACCEPT -<nick> -- Remove a permitted nickname
/QUOTE ACCEPT * -- List the present permitted nicknames