Cisco Cisco Email Security Appliance C650 ユーザーガイド
Chapter 1 Getting Started with the IronPort Email Security Appliance
1-20
Cisco IronPort AsyncOS 7.1 for Email Configuration Guide
OL-22158-02
•
Access control for inbound senders, based upon the sender’s IP address, IP
address range, or domain.
address range, or domain.
•
Extensive message filtering technology allows you to enforce corporate
policy and act on specific messages as they enter or leave your corporate
infrastructure. Filter rules identify messages based on message or attachment
content, information about the network, message envelope, message headers,
or message body. Filter actions allow messages to be dropped, bounced,
archived, blind carbon copied, or altered, or to generate notifications.
policy and act on specific messages as they enter or leave your corporate
infrastructure. Filter rules identify messages based on message or attachment
content, information about the network, message envelope, message headers,
or message body. Filter actions allow messages to be dropped, bounced,
archived, blind carbon copied, or altered, or to generate notifications.
•
Message encryption via secure SMTP over Transport Layer Security
ensures messages travelling between your corporate infrastructure and other
trusted hosts are encrypted.
ensures messages travelling between your corporate infrastructure and other
trusted hosts are encrypted.
•
Virtual Gateway™ technology allows the IronPort appliance to function as
several email gateways within a single server, which allows you to partition
email from different sources or campaigns to be sent over separate IP
addresses. This ensures that deliverability issues affecting one IP address do
not impact others.
several email gateways within a single server, which allows you to partition
email from different sources or campaigns to be sent over separate IP
addresses. This ensures that deliverability issues affecting one IP address do
not impact others.
AsyncOS for Email is a proprietary operating system that has been highly
optimized for the task of Internet messaging. AsyncOS is a “hardened” operating
system: all unnecessary services have been removed, which increases security and
optimizes system performance. IronPort stackless threading technology
eliminates allocation of a dedicated memory stack to each task, which increases
concurrency and stability of the MTA. The custom I/O-driven scheduler is
optimized for massively concurrent I/O events required by the email gateway
versus the preemptive time slicing of the CPU in traditional operating systems.
AsyncFS, the file system underlying AsyncOS, is optimized for millions of small
files and ensures data recoverability in the case of system failure.
optimized for the task of Internet messaging. AsyncOS is a “hardened” operating
system: all unnecessary services have been removed, which increases security and
optimizes system performance. IronPort stackless threading technology
eliminates allocation of a dedicated memory stack to each task, which increases
concurrency and stability of the MTA. The custom I/O-driven scheduler is
optimized for massively concurrent I/O events required by the email gateway
versus the preemptive time slicing of the CPU in traditional operating systems.
AsyncFS, the file system underlying AsyncOS, is optimized for millions of small
files and ensures data recoverability in the case of system failure.
AsyncOS for email supports RFC 2821-compliant Simple Mail Transfer Protocol
(SMTP) to accept and deliver messages. The IronPort appliance is designed to be
easy to configure and manage. Most reporting, monitoring, and configuration
commands are available through both the web-based GUI via HTTP or HTTPS.
In addition, an interactive Command Line Interface (CLI) which you access from
a Secure Shell (SSH), telnet, or direct serial connection is provided for the system.
The IronPort appliance also features a robust logging capability, allowing you to
configure log subscriptions spanning the functionality of the entire system and
reducing the time spent finding the information you need.
(SMTP) to accept and deliver messages. The IronPort appliance is designed to be
easy to configure and manage. Most reporting, monitoring, and configuration
commands are available through both the web-based GUI via HTTP or HTTPS.
In addition, an interactive Command Line Interface (CLI) which you access from
a Secure Shell (SSH), telnet, or direct serial connection is provided for the system.
The IronPort appliance also features a robust logging capability, allowing you to
configure log subscriptions spanning the functionality of the entire system and
reducing the time spent finding the information you need.