Cisco Cisco Email Security Appliance C160 Guía Del Usuario
19-25
Cisco AsyncOS 8.5.5 for Email Security User Guide
Chapter 19 Email Authentication
Enabling SPF and SIDF
The following example shows a user configuring the SPF/SIDF verification using the SPF Only
conformance level. The appliance performs the HELO identity check and accepts the None and Neutral
verification results and rejects the others. The CLI prompts for the SMTP actions are the same for all
identity types. The user does not define the SMTP actions for the MAIL FROM identity. The appliance
automatically accepts all verification results for the identity. The appliance uses the default reject code
and text for all REJECT results.
conformance level. The appliance performs the HELO identity check and accepts the None and Neutral
verification results and rejects the others. The CLI prompts for the SMTP actions are the same for all
identity types. The user does not define the SMTP actions for the MAIL FROM identity. The appliance
automatically accepts all verification results for the identity. The appliance uses the default reject code
and text for all REJECT results.
SIDF Compatible
•
whether to perform a HELO identity check
•
whether the verification downgrades a Pass result of the
PRA identity to None if the Resent-Sender: or
Resent-From: headers are present in the message
PRA identity to None if the Resent-Sender: or
Resent-From: headers are present in the message
•
SMTP actions taken based on the results of the
following identity checks:
following identity checks:
–
HELO identity (if enabled)
–
MAIL FROM Identity
–
PRA Identity
•
SMTP response code and text returned for the REJECT
action
action
•
verification timeout (in seconds)
SIDF Strict
•
SMTP actions taken based on the results of the
following identity checks:
following identity checks:
–
MAIL FROM Identity
–
PRA Identity
•
SMTP response code and text returned in case of SPF
REJECT action
REJECT action
•
verification timeout (in seconds)
Table 19-4
SPF Control Settings via the CLI
Conformance Level
Available SPF Control Settings
Would you like to change SPF/SIDF settings? [N]> yes
Would you like to perform SPF/SIDF Verification? [N]> yes
What Conformance Level would you like to use?
1. SPF only
2. SIDF compatible
3. SIDF strict
[2]> 1