PLANET CS-2001 - Manual (Page 517)

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Step 6. Delete all spam emails in the Spam Mail folder; since they have been
compressed and uploaded to CS-2001, they are of no use any longer:
 In the Spam Mail folder, select all emails, right-click them, and then
click Delete on shortcut menu. （Figure 13-53）
 All spam emails have been deleted.
（Figure 13-54）
Figure 13-53 Selecting All Spam Emails to Delete