Cisco Cisco Email Security Appliance C190 ユーザーガイド

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Cisco AsyncOS 8.0.2 for Email User Guide
 
Chapter 21      Configuring Routing and Delivery Features 
  Review: Email Pipeline
Note
For outgoing mail, RSA Email Data Loss Prevention scanning takes place after the Outbreak Filters 
stage.
Table 21-11
Email Pipeline for the Cisco Appliance: Receiving Email Features
Feature
Description
Host Access Table (HAT)
Host DNS Sender Verification
Sender Groups
Envelope Sender Verification
Sender Verification Exception Table
Mail Flow Policies
ACCEPT, REJECT, RELAY, or TCPREFUSE connections
Maximum outbound connections
Maximum concurrent inbound connections per IP address
Maximum message size and messages per connection
Maximum recipients per message and per hour
TCP listen queue size
TLS: no/preferred/required
SMTP AUTH: no/preferred/required
Drop email with malformed FROM headers
Always accept or reject mail from entries in the Sender Verification Exception Table.
SenderBase on/off (IP profiling/flow control) 
Received Header
Adds a received header to accepted email: on/off.
Default Domain
Adds default domain for “bare” user addresses.
Bounce Verification
Used to verify incoming bounce messages as legitimate.
Domain Map
Rewrites the Envelope Recipient for each recipient in a message that matches a domain 
in the domain map table. 
Recipient Access Table (RAT) 
(Public listeners only) ACCEPT or REJECT recipients in 
RCPT TO 
plus Custom SMTP 
Response. Allow special recipients to bypass throttling. 
Alias tables
Rewrites the Envelope Recipient. (Configured system-wide. 
aliasconfig
 is not a 
subcommand of 
listenerconfig
.)
LDAP Recipient Acceptance
LDAP validation for recipient acceptance occurs within the SMTP conversation. If the 
recipient is not found in the LDAP directory, the message is dropped or bounced. LDAP 
validation can be configured to occur within the work queue instead.