Google Message Security for Google Apps Administration Guide - Manual (Page 173)

Spam Filters 173
You can see a message’s spam score, whether or not it’s tagged as spam, by
looking at the message header. For details, see “ Interpreting Header Fields” on
page 401.
Why Catch Rates Might Vary
Developing an effective technology for filtering spam is an ongoing effort since
spammers are always evolving tactics to avoid detection. To combat new and
ever-changing threats, the message service continually calibrates its detection
and filtering mechanisms, always striking a balance between catching the most
spam while lowering the rate of falsely quarantined messages.
As we make adjustments, you might notice slight variances in catch rates for
certain spam categories. Or you might see an increase in falsely quarantined
messages. If this happens, you might want to increase or decrease your own
spam filter levels accordingly: Increase sensitivity to catch more spam, or
decrease levels to prevent false quarantines. For details, see “Fine-Tune Spam
Filters” on page 179.
When to Use Content Manager Along With Blatant Spam
Blocking
If you experience messages with undesirable content like profanity not being
caught by your spam filters, you can add Content Manager filters to catch those
messages.
If the objectionable content is limited to a few words and the other content does
not score as spam, then the message would not trigger the spam filters. To stop
these types of messages, you can create content filters that look for exactly the
offending language you wish to prohibit.
For information about creating content filters for these kinds of messages, see
“Block Messages with Profanity” on page 236.
Configure Spam Settings for an Organization
You configure Blatant Spam Blocking (BSB), which deletes the most obvious
spam, and Spam Disposition, which determines how spam messages are
managed for a user organization.
You will enable spam filtering and set filter levels for the default user (the template
use for an organization). See “Enable and Adjust Spam Filters” on page 177 for
more information.