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Cisco ASA 5500 Series Configuration Guide using ASDM
OL-20339-01
Chapter 37 Configuring Inspection of Basic Internet Protocols
SMTP and Extended SMTP Inspection
• The MAIL and RCPT commands specify who are the sender and the receiver of the mail. Mail
addresses are scanned for strange characters. The pipeline character (|) is deleted (changed to a blank
space) and “<” ‚”>” are only allowed if they are used to define a mail address (“>” must be preceded
by “<”).
• Unexpected transition by the SMTP server.
• For unknown commands, the adaptive security appliance changes all the characters in the packet to
X. In this case, the server generates an error code to the client. Because of the change in the packed,
the TCP checksum has to be recalculated or adjusted.
• TCP stream editing.
• Command pipelining.
Select ESMTP Map
The Select ESMTP Map dialog box is accessible as follows:
Add/Edit Service Policy Rule Wizard > Rule Actions >
Protocol Inspection Tab >Select ESMTP Map
The Select ESMTP Map dialog box lets you select or create a new ESMTP map. An ESMTP map lets
you change the configuration values used for ESMTP application inspection. The Select ESMTP Map
table provides a list of previously configured maps that you can select for application inspection.
Fields
• Use the default ESMTP inspection map—Specifies to use the default ESMTP map.
• Select an ESMTP map for fine control over inspection—Lets you select a defined application
inspection map or add a new one.
• Add—Opens the Add Policy Map dialog box for the inspection.
Modes
The following table shows the modes in which this feature is available:
ESMTP Inspect Map
The ESMTP Inspect Map dialog box is accessible as follows:
Configuration > Global Objects > Inspect Maps > ESMTP
The ESMTP pane lets you view previously configured ESMTP application inspection maps. An ESMTP
map lets you change the default configuration values used for ESMTP application inspection.
Firewall Mode Security Context
Routed Transparent Single
Multiple
Context System
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