User manual

Whether or not an image is classified as offensive depends on the threshold set here.
Possible values range from 0 to 100. Theoretically, "genuine" pornographic or hardcore
images can reach a value of 100. In practice however, these values lie between 35 and
65.
More than 80 % of all images reach values between 45 and 50. We therefore recommend
to set the threshold to 51. This value will identify images with "a lot of naked skin" such as
pin-ups. A threshold below 50 does not make sense, as these images are likely not to be
pornographic. In this example, the action defined is triggered when the threshold of 51 is
reached or exceeded. The overall result for the e-mail is the highest value of all images
attached.
E-mails with images that could not be classified (e.g. charts) are delivered to the
recipient, unless they also contains images that could be classified and have reached the
threshold.
Scan inside compressed attachments means that the internal unpacker extracts files
from archives and checks them for unwanted images. If this option is disabled, only the
archive is checked and identified as compressed format.
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