PLANET CS-2001 - Manual (Page 526)

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Step 11. Go to Mail Security> Anti-Spam > Training, configure the settings
under the Ham Training Using Importing section.
 Paste the pathname of the Ham Mail folder to the Import ham mail
from field.
 Click lower right OK to import the folder; the ham filtering will be
trained on schedules. （Figure 13-63）
Figure 13-63 Importing Normal Emails for Ham-Filtering Training