PLANET CS-2001 - Manual (Page 527)

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Step 12. Delete all emails in the Ham Mail folder; since they have been
compressed and uploaded to CS-2001, they are of no use any longer:
 In the Ham Mail folder, select all normal emails, right-click them, and
then click Delete on shortcut menu. （Figure 13-64）
 All normal emails have been deleted.
（Figure 13-65）
Figure 13-64 Selecting All Normal Emails to Delete