Symantec Mail Security, Administration Manual

Page: 102 / 258

102 Configuring email filtering
Managing Email Firewall policies
2 Click one of the Blocked or Allowed Sender groups, depending on the list
that you want to work with.
A red x in the Enabled column indicates that the entry is currently disabled.
A green check mark in the Enabled column indicates that the entry is
currently enabled.
3 In the list of senders, do one of the following:
■
To enable a sender entry that is currently disabled, check the box
adjacent the sender information, and then click
Enable .
■
To disable a sender entry that is currently enabled, check the box
adjacent the sender information, and then click
Disable .
4
Click Save .
Importing allowed and blocked sender information
If you have many senders and addresses to add to your Blocked Senders Lists or
Allowed Senders Lists, it is often easier to place the sender information in a text
file and then import the file. This section describes how to format that file.
Maximum number of entries in an allowed and blocked sender file
Be aware of the following limitations when importing senders:
■
The maximum number of sender lines per file when importing senders is
500,000. To add more (up to the limit noted below), divide senders into
multiple files and import multiple times.
■
The maximum number of total allowed and blocked senders that can be
stored is 650,000.
■
No warning is displayed if you exceed these limits. Sender data is silently
dropped.
Format of allowed and blocked sender file
The file is line-oriented and uses a format similar to the Lightweight Directory
Interchange Format (LDIF). It has the following restrictions and characteristics:
■
The file is in the installation directory, in the following location:
/scanner/rules/allowedblockedlist.txt
■
The file must have the required LDIF header that is included upon
installation. Do not change the first three uncommented lines:
dn: cn=mailwall@uninvitedads.com, ou=bmi
objectclass: top
objectclass: uiaBlackWhiteList