94 Setting your antispam policy
Blocking by real-time antispam blacklists
Blocking by real-time antispam blacklists
The most common way of preventing spam is to reject mail that comes from
mail servers known or believed to send spam. To limit potential spam, Symantec
Mail Security for SMTP can support up to three real-time antispam blacklists.
Real-time blacklists are DNS-based blocking lists that are generated to limit
spam. You may choose to use these lists to drop, forward, or log mail from
certain sources, based on criteria that are determined by the list operators. Real-
time blacklisting depends on an actively maintained DNS server with a database
of IP addresses that are associated with Internet mail servers that are judged to
be abusive on one or more spam-related criteria.
Symantec Mail Security for SMTP queries the real-time blacklist for the IP
address of a sending mail host. If the query response indicates that the address
is listed in the real-time blacklist database, then Symantec Mail Security for
SMTP refuses the connection attempt.
Symantec Mail Security for SMTP lets administrators specify up to three
domains to query against.
To block by real-time antispam blacklists
1
On the Symantec Mail Security for SMTP administrative interface, in the
left pane, click
Anti-spam Policy
.
Summary of Contents for 11105111 - SYM MAIL SEC SMTP 5.0 SMS PORT MEDIA CD EN
Page 1: ...Symantec Mail Security for SMTP...
Page 8: ...8...
Page 44: ...44 Installing Symantec Mail Security for SMTP Uninstalling Symantec Mail Security for SMTP...
Page 88: ...88 Setting your antivirus policy Setting up your own LiveUpdate server...
Page 124: ...124 Setting your antispam policy Blocking by custom spam rules...
Page 140: ...140 Setting your filtering policy Blocking by custom content rules...
Page 170: ...170...
