PLANET CS-2001 - Manual (Page 512)

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Step 3. Compact the Spam Mail folder to make it easier importing spam messages
onto CS-2001 for spam filtering training:
 Click the Spam Mail folder.
（Figure 13-48）
 In the upper left corner, click File, point to Folder, and then click
Compact. （Figure 13-49）
Figure 13-48 Selecting the Spam Mail Folder