Cisco Cisco Email Security Appliance C190 Guida Utente
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Cisco IronPort AsyncOS 7.3 for Email Advanced Configuration Guide
OL-23081-01
Chapter 6 Using Message Filters to Enforce Email Policies
The filter performs matches loosely. It is not case-sensitive. If the optional
sieve-char parameter is supplied, the last portion of an address that follows the
specified character will be ignored for the purposes of comparison. For example,
if the
sieve-char parameter is supplied, the last portion of an address that follows the
specified character will be ignored for the purposes of comparison. For example,
if the
+
character is included as a parameter, the filter ignores the portion of the
address
joe+folder@example.com
that follows the
+
character. If the address was
joe+smith+folder@example.com
, only the
+folder
portion is ignored. If the
SMTP authenticated user ID string is a simple username and not a fully-qualified
e-mail address, only the username portion of the target will be examined to
determine a match. The domain must be verified in a separate rule.
e-mail address, only the username portion of the target will be examined to
determine a match. The domain must be verified in a separate rule.
Also, you can use the $SMTPAuthID variable to insert the STMP authenticated
user ID into headers.
user ID into headers.
The following table shows examples of comparisons between the SMTP
authenticated ID and email addresses and whether they would match using the
authenticated ID and email addresses and whether they would match using the
smtp-auth-id-matches
filter rule:
*Any
Matches messages that were
created during an authenticated
SMTP session regardless of
identity.
created during an authenticated
SMTP session regardless of
identity.
*None
Matches messages that were not
created during an authenticated
SMTP session. This is useful
when authentication is optional
(preferred).
created during an authenticated
SMTP session. This is useful
when authentication is optional
(preferred).
Target
Description
SMTP Auth ID
Sieve Char
Comparison Address
Matches?
someuser
otheruser@example.com
No
someuser
someuser@example.com
Yes
someuser
someuser@another.com
Yes
SomeUser
someuser@example.com
Yes
someuser
someuser+folder@example.com
No
someuser
+
someuser+folder@example.com
Yes
someuser@example.com
someuser@forged.com
No