Which three are necessary for antispam to function properly on a branch SRX Series device?
(Choose three.)
A.
an antispam license
B.
DNS servers configured on the SRX Series device
C.
SMTP services on SRX
D.
a UTM profile with an antispam configuration in the appropriate security policy
E.
antivirus (full or express)
http://www.juniper.net/techpubs/en_US/junos12.1×46/topics/example/utm-antispam-filter-server-based-configuring-cli.html
Server-based antispam filtering requires Internet connectivity with the spam block list (SBL) server. Domain Name Service (DNS) is required to access the SBL server.