You change the detection sensitivity and the action the service takes with a flagged image. You change the way the Image Control service detects inappropriate images at a global level. Alternatively you specify custom settings for each email domain that you are provisioned with in the cloud security services.
When the detection sensitivity is low you detect fewer images, but also have lower false-positive rates.
You change your global detection settings at:
Services > Email services > Image Control > Global Settings
You change your email domain settings at:
Services > Email services > Image Control > [domain name]
You take the following actions on inbound and outbound mail:
Scan Microsoft Office and PDF files.
Use Image Control Analysis heuristics.
Match the image against a publicly-distributed list of inappropriate images (global list).
Match the image against your own list of inappropriate images (client list).
You take one of the following actions on the images that the scan flags as inappropriate:
Block and delete the suspected email.
Redirect the suspected email to the Image Control administrator.
Copy the suspected email to the Image Control administrator.
Tag suspected email in the header.
Tag the subject line but allow the email through.
If you block and delete emails you lose all falsely-identified emails, which can annoy users. Rather than block and delete, we recommend that you copy or redirect identified emails to the Image Control administrator.
To ensure business-critical images pass through the Image Control filters, you must designate approved senders and recipients, and lists of approved images.
Imported Document ID: HOWTO101632
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