Support
Disable intrusion
prevention
When this option is selected, the scan of the SMTP protocol will be disabled and traffic
will be authorized if the filter policy allows it.
Log each SMTP
request
Enables or disables the logging of SSL requests.
“Proxy” tab
Filter the welcome
banner
When this option is selected, the server’s banner will become anonymous during an
SMTP connection.
HELO Command
Replace the client's
domain name with its
IP address
During a basic identification, the client enters its domain name by executing the HELO
command. By selecting this option, the domain name will be replaced by the IP
address.
Filter domain name
Enable server’s domain
name filtering
This option allows deleting the domain name of the SMTP server from its response to a
HELO command coming from a client. This filter is enabled by default.
Connection
Keep original source IP
address
When a request is made by a web client (browser) to the server, the firewall will
intercept it and check that the request complies with URL filter rules and then relays
the request.
If this option is selected, the new request will use the original source IP address of the
web client that sent the packet. Otherwise, the firewall’s address will be used.
Limits when sending an e-mail
By default, the data size limit for the outgoing mail message (text line) is enabled. Its maximum
has been set to 1000 according to the RFC 2821.
Restrict the size of
message lines
Sets a limit on the length of the lines in an outgoing message.
Message line [1000-
2048 (KB)]
This field indicates the maximum length of a line when sending a message.
REMARK
Imposing a maximum size for elements (in bytes) allows countering buffer
overflow attacks.
Max. no. of recipients Indicates the maximum number of recipients that a message can contain. The firewall
will refuse messages with too many recipients (the refusal will be indicated by an
SMTP error). This allows restricting spam.
Maximum size of the
message [0 –
2147483647 (KB)]
Indicates the maximum size of messages passing through the Stormshield Network
firewall. Messages exceeding the defined size will be refused by the firewall.
“SMTP Commands” tab
This menu allows you to authorize or reject SMTP commands defined in the RFCs. You can let
commands pass, block them or analyze the syntax and check that the command complies with
the current RFCs in force.
Page 261/448 sns-en-user_configuration_manual-v3 - Copyright © Stormshield 2016
SNS - USER CONFIGURATION MANUAL V.3
PROTOCOLS
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