Watchguard V10 User Manual page 282

CHAPTER 10: Using Proxies
Proxy Action Rule ordering example
This example describes how you can use proxy action rule
ordering to strip a specific MIME subtype, while still
allowing the rest of the master MIME type. This example
uses the SMTP-Inbound proxy action, with the default set-
tings.
In this example, the strip rule for the MIME subtype
(image/tiff) is ordered so it is above the allow rule for the
MIME type (image).
The image/tiff rule is an exact match rule for the MIME
type "image/tiff," and the image/* rule is a pattern match
rule for the master type "image/*." At runtime, the proxy
processes the image/tiff rule first, so images of type TIF are
identified and stripped. However, all other "image" sub-
types do not match the TIF rule, and pass on to subsequent
rules. When they reach the rule that allows the master type
(image/*), they are identified and allowed.
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