Cisco Cisco Email Security Appliance C650 Guía Del Usuario
5-6
User Guide for AsyncOS 9.8 for Cisco Email Security Appliances
Chapter 5 Configuring the Gateway to Receive Email
Configuring Global Settings for Listeners
Step 4
Submit and commit your changes.
Related Topics
•
Settings for Messages Containing Multiple Encodings
You can define the behavior of the appliance while modifying the message encoding for the following
parameters:
parameters:
•
Headers
•
Untagged non-ASCII headers
•
Mismatched footer or heading encoding
Timeout Period for
Unsuccessful Inbound
Connections
Unsuccessful Inbound
Connections
Set the length of time AsyncOS will allow an unsuccessful inbound
connection to remain intact before closing it.
connection to remain intact before closing it.
An unsuccessful connection can be an SMTP conversation in which SMTP
or ESMTP commands continue to be issued without a successful message
injection occurring. When the specified timeout is reached, the behavior is
to send an error and disconnect:
or ESMTP commands continue to be issued without a successful message
injection occurring. When the specified timeout is reached, the behavior is
to send an error and disconnect:
“421 Timed out waiting for successful message injection, disconnecting.”
A connection is considered unsuccessful until it successfully injects a
message.
message.
Only available for SMTP connections on public listeners. The default value
is 5 minutes.
is 5 minutes.
Total Time Limit for All
Inbound Connections
Inbound Connections
Set the length of time AsyncOS will allow an inbound connection to remain
intact before closing it.
intact before closing it.
This setting is intended to preserve system resources by enforcing a
maximum allowable connection time. Once about 80% of this maximum
connection time is reached the following message is issued:
maximum allowable connection time. Once about 80% of this maximum
connection time is reached the following message is issued:
“421 Exceeded allowable connection time, disconnecting.”
The appliance will attempt to disconnect when the connection exceeds 80%
of the maximum connection time in order to prevent disconnecting
mid-message. It is likely that a problem is occurring with the inbound
connection if it is open long enough to reach 80% of the maximum
connection time. Keep this threshold in mind when specifying the time limit.
of the maximum connection time in order to prevent disconnecting
mid-message. It is likely that a problem is occurring with the inbound
connection if it is open long enough to reach 80% of the maximum
connection time. Keep this threshold in mind when specifying the time limit.
Only available for SMTP connections on public listeners. The default value
is 15 minutes.
is 15 minutes.
Maximum size of subject
Messages having subject size within the specified limit will be accepted and
any other messages will be rejected. If you set this value to 0, no limit is
applied.
any other messages will be rejected. If you set this value to 0, no limit is
applied.
Table 5-1
Listener Global Settings
Global Setting
Description