Cisco Cisco Email Security Appliance C170 Betriebsanweisung
Glossary
GL-5
User Guide for AsyncOS 9.7 for Cisco Email Security Appliances
MTA
Mail Transfer Agent, or Messaging Transfer Agent. The program responsible for
accepting, routing, and delivering email messages. Upon receiving a message
from a Mail User Agent or another MTA, the MTA stores a message temporarily
locally, analyses the recipients, and routes it to another MTA (routing). It may
edit and/or add to the message headers. The Cisco appliance is an MTA that
combines hardware, a hardened operating system, application, and supporting
services to produce a purpose-built, rack-mount server appliance dedicated for
enterprise messaging.
accepting, routing, and delivering email messages. Upon receiving a message
from a Mail User Agent or another MTA, the MTA stores a message temporarily
locally, analyses the recipients, and routes it to another MTA (routing). It may
edit and/or add to the message headers. The Cisco appliance is an MTA that
combines hardware, a hardened operating system, application, and supporting
services to produce a purpose-built, rack-mount server appliance dedicated for
enterprise messaging.
MUA
Mail User Agent. The program that allows the user to compose and read email
messages. The MUA provides the interface between the user and the Message
Transfer Agent. Outgoing mail is eventually handed over to an MTA for delivery.
messages. The MUA provides the interface between the user and the Message
Transfer Agent. Outgoing mail is eventually handed over to an MTA for delivery.
MX Record
Specifies the MTA on the Internet responsible for accepting mail for a specified
domain. A Mail Exchange record creates a mail route for a domain name. A
domain name can have multiple mail routes, each assigned a priority number.
The mail route with the lowest number identifies the primary server responsible
for the domain. Other mail servers listed will be used as backup.
domain. A Mail Exchange record creates a mail route for a domain name. A
domain name can have multiple mail routes, each assigned a priority number.
The mail route with the lowest number identifies the primary server responsible
for the domain. Other mail servers listed will be used as backup.
N
Non-Conversational
Bounce
Bounce
A bounce that occurs due to a message being returned after the message was
accepted for delivery by the recipient host. These can be soft (4XX) or hard
(5XX) bounces. You can analyze these bounce responses to determine what to
do with the recipient messages (e.g. re-send soft bounced recipient messages and
remove hard bounced recipients from database).
accepted for delivery by the recipient host. These can be soft (4XX) or hard
(5XX) bounces. You can analyze these bounce responses to determine what to
do with the recipient messages (e.g. re-send soft bounced recipient messages and
remove hard bounced recipients from database).
NTP
Network Time Protocol. The
ntpconfig
command configures IronPort
AsyncOS to use Network Time Protocol (NTP) to synchronize the system clock
with other computers.
with other computers.
O
Open Relay
An open relay (sometimes called an “insecure relay” or a “third party” relay) is
an SMTP email server that allows unchecked third-party relay of email
messages. By processing email that is neither for nor from a local user, an open
relay makes it possible for an unknown senders to route large volumes of email
(typically spam) through your gateway. The
an SMTP email server that allows unchecked third-party relay of email
messages. By processing email that is neither for nor from a local user, an open
relay makes it possible for an unknown senders to route large volumes of email
(typically spam) through your gateway. The
listenerconfig
and
systemsetup
commands prevent you from unintentionally configuring your
system as an open relay.
Outbreak Filters
IronPort’s Outbreak Filters feature provides an additional layer of protection
from viruses. The Outbreak Filters feature quarantines suspicious email
messages, holding the messages until an updated virus IDE is available. or until
they are deemed not a threat.
from viruses. The Outbreak Filters feature quarantines suspicious email
messages, holding the messages until an updated virus IDE is available. or until
they are deemed not a threat.