Yeah, check this:
# UseStrictPrivMsg [OPTIONAL]
# Using this directive will force services to only respond to privmsgs
# addressed to Nick@ServerName - e.g. NickServ@localhost.net.
# This should be used on conjunction with ircd aliases.
#
# When using Bahamut, this option will NOT work if the uplink server is
# configured as a services hub. The serviceshub option is not designed to
# be used with Anope.
#UseStrictPrivMsg