Cisco Cisco Email Security Appliance X1070 Guia Do Utilizador
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Cisco AsyncOS 8.5.5 for Email Security User Guide
Chapter 13 Anti-Spam
Defining Anti-Spam Policies
Unwanted Marketing Messages From Legitimate Sources
Both anti-spam scanning engines can distinguish between spam and unwanted marketing messages from
a legitimate source. Even though marketing messages are not considered spam, your organization or
end-users may not want to receive them. Like spam, you have the option to deliver, drop, quarantine, or
bounce unwanted marketing messages. You also have the option to tag unwanted marketing messages by
adding text to the message’s subject to identify it as marketing.
a legitimate source. Even though marketing messages are not considered spam, your organization or
end-users may not want to receive them. Like spam, you have the option to deliver, drop, quarantine, or
bounce unwanted marketing messages. You also have the option to tag unwanted marketing messages by
adding text to the message’s subject to identify it as marketing.
Using Custom Headers to Redirect URLs in Suspected Spam to the Cisco Web
Security Proxy: Configuration Example
Security Proxy: Configuration Example
You can rewrite URLs in suspected spam so that when a recipient clicks a link in the message, the request
is routed through the Cisco Web Security proxy service, which evaluates the safety of the site at click
time and blocks access to known malicious sites.
is routed through the Cisco Web Security proxy service, which evaluates the safety of the site at click
time and blocks access to known malicious sites.
Before You Begin
Enable the URL Filtering feature and its prerequisites. See
Procedure
Step 1
Apply a custom header to suspected spam messages:
a.
Select Mail Policies > Incoming Mail Policies.
b.
Click the link in the Anti-Spam column for a policy such as the Default policy.
c.
In the Suspected Spam Settings section, enable suspected spam scanning.
d.
Click Advanced to display the Add Custom Header option.
e.
Add a custom header such as
url_redirect
.
f.
Submit and commit your changes.
Step 2
Create a content filter to redirect URLs in messages that have the custom header:
a.
Select Mail Policies > Incoming Content Filters.
b.
Click Add Filter.
c.
Name the filter
url_redirect
.
d.
Click Add Condition.
e.
Click Other Header.
f.
Enter the header name:
url_redirect
.
Make sure this exactly matches the header you created above.
g.
Select Header exists.
h.
Click OK.
i.
Click Add Action.
j.
Click URL Category.
k.
Select all categories in Available Categories and add them to Selected Categories.
l.
For Action on URL, select Redirect to Cisco Security Proxy.