Symantec Mail Security, Руководство администратора

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26 Configuring system settings
Configuring host (Scanner) settings
Settings also exist governing SMTP delivery configuration for your site.
Delivery configuration message settings are as follows:
Maximum message
size in bytes Sets the maximum size allowable for a message before it is
rejected. The default is 10,485,760 bytes.
Maximum number
of recipients per
message Indicates the maximum number of recipients permitted to receive
this message. The default is 1,024 recipients.
Default domain for
sender addresses
with no domain Sets a default domain when none can be found in the message.
Insert RECEIVED
header Places a RECEIVED header in the message during outbound SMTP
processing when checked. When unchecked, no RECEIVED header
is inserted during outbound SMTP processing. If Insert RECEIVED
header and Strip RECEIVED headers are both checked, the
outbound SMTP RECEIVED header remains when the message
goes to the delivery queue.
Strip pre-existing
RECEIVED headers
from outbound
messages Removes all RECEIVED headers for the message when checked.
When headers are stripped, message looping can occur depending
on the settings of other MTAs. When unchecked, RECEIVED
headers remain in the message during outbound processing. The
RECEIVED header for outbound SMTP processing remains in the
message when Insert a RECEIVED header and Strip pre-existing
RECEIVED headers from outbound messages are checked.
Enable reverse DNS
lookup Causes the system to perform reverse DNS lookup on the SMTP
client IP addresses to resolve the IP address to a name. when
checked. This is the default condition. When unchecked, reverse
DNS lookup is not allowed for outbound messages.
Table 2-3 SMTP delivery advanced setting descriptions
Item Description
Maximum number
of external
connections Sets the maximum number of simultaneously allowed external
connections. Additional attempted connections are rejected. The
default is 100 connections.
Maximum number
of external
connections to a
single IP address Sets the maximum number of simultaneous connections allowed
to a single IP address. Additional connections to this IP address are
rejected. The default is 50 connections. You can also limit the
number of connections to a single IP address per time period.
Table 2-2 Outbound SMTP advanced setting descriptions
Item Description