Cisco Cisco Email Security Appliance C170 Betriebsanweisung
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Cisco IronPort AsyncOS 7.1 for Email Configuration Guide
OL-22158-02
Chapter 4 Understanding the Email Pipeline
* These features can send messages to special queues called Quarantines.
** Can send messages to the IronPort Spam Quarantine.
Incoming / Receiving
The receiving phase of the Email Pipeline involves the initial connection from the
sender’s host. Each message’s domains can be set, the recipient is checked, and
the message is handed off to the work queue.
sender’s host. Each message’s domains can be set, the recipient is checked, and
the message is handed off to the work queue.
Host Access Table (HAT), Sender Groups, and Mail Flow Policies
The HAT allows you to specify hosts that are allowed to connect to a listener (that
is, which hosts you will allow to send email).
is, which hosts you will allow to send email).
Sender Groups are used to associate one or more senders into groups, upon which
you can apply message filters, and other Mail Flow Policies. Mail Flow Policies
are a way of expressing a group of HAT parameters (access rule, followed by rate
limit parameters and custom SMTP codes and responses).
you can apply message filters, and other Mail Flow Policies. Mail Flow Policies
are a way of expressing a group of HAT parameters (access rule, followed by rate
limit parameters and custom SMTP codes and responses).
Together, sender groups and mail flow policies are defined in a listener’s HAT.
Delivery limits
1. Sets the default delivery interface.
2. Sets the total maximum number of outbound
connections.
connections.
Domain-based Limits
Defines, per-domain: maximum outbound
connections for each virtual gateway and for the
entire system; the bounce profile to use; the TLS
preference for delivery: no/preferred/required
connections for each virtual gateway and for the
entire system; the bounce profile to use; the TLS
preference for delivery: no/preferred/required
Domain-based routing
Routes mail based on domain without rewriting
Envelope Recipient.
Envelope Recipient.
Global unsubscribe
Drops recipients according to specific list
(configured system-wide).
(configured system-wide).
Bounce profiles
Undeliverable message handling. Configurable per
listener, per Destination Controls entry, and via
message filters.
listener, per Destination Controls entry, and via
message filters.
Table 4-2
Email Pipeline for the IronPort Appliance: Routing and Delivery Features