Cisco Cisco Email Security Appliance C650 用户指南
7-11
Cisco AsyncOS 8.0.2 for Email User Guide
Chapter 7 Defining Which Hosts Are Allowed to Connect Using the Host Access Table (HAT)
Understanding Predefined Sender Groups and Mail Flow Policies
SUSPECTLIST
The Suspectlist sender group contains a mail flow
policy that throttles, or slows, the rate of incoming
mail. If senders are suspicious, you can add them
to the Suspectlist sender group, where the mail
flow policy dictates that:
policy that throttles, or slows, the rate of incoming
mail. If senders are suspicious, you can add them
to the Suspectlist sender group, where the mail
flow policy dictates that:
•
Rate limiting limits the maximum number of
messages per session, the maximum number
of recipients per message, the maximum
message size, and the maximum number of
concurrent connections you are willing to
accept from a remote host.
messages per session, the maximum number
of recipients per message, the maximum
message size, and the maximum number of
concurrent connections you are willing to
accept from a remote host.
•
The maximum recipients per hour from the
remote host is set to 20 recipients per hour.
Note that this setting is the maximum
throttling available. You can increase the
number of recipients to receive per hour if this
parameter is too aggressive.
remote host is set to 20 recipients per hour.
Note that this setting is the maximum
throttling available. You can increase the
number of recipients to receive per hour if this
parameter is too aggressive.
•
The content of messages will be scanned by
the anti-spam scanning engine and the
anti-virus scanning engine (if you have these
feature enabled for the system).
the anti-spam scanning engine and the
anti-virus scanning engine (if you have these
feature enabled for the system).
•
The Cisco SenderBase Reputation Service
will be queried for more information about
the sender.
will be queried for more information about
the sender.
$THROTTLED
UNKNOWNLIST
The Unknownlist sender group may be useful if
you are undecided about the mail flow policy you
should use for a given sender. The mail flow
policy for this group dictates that mail is accepted
for senders in this group, but the Cisco Anti-Spam
software (if enabled for the system), the anti-virus
scanning engine, and the Cisco SenderBase
Reputation Service should all be used to gain
more information about the sender and the
message content. Rate limits for senders in this
group are also enabled with default values. For
more information on virus scanning engines, see
you are undecided about the mail flow policy you
should use for a given sender. The mail flow
policy for this group dictates that mail is accepted
for senders in this group, but the Cisco Anti-Spam
software (if enabled for the system), the anti-virus
scanning engine, and the Cisco SenderBase
Reputation Service should all be used to gain
more information about the sender and the
message content. Rate limits for senders in this
group are also enabled with default values. For
more information on virus scanning engines, see
. For
more information on the SenderBase Reputation
Service, see
Service, see
.
$ACCEPTED
ALL
.
$ACCEPTED
Table 7-6
Predefined Sender Groups and Mail Flow Policies for Public Listeners (continued)
Predefined Sender Group
Description
Default Configured
Mail Flow Policy
Mail Flow Policy