Command - DEL
Usage   - DEL range

Deletes the memo range range (as given by the LIST command)
from your memo list.  Note that DEL does not actually remove
the memo, but simply marks it as deleted (indicated with D in
the LIST display).  The memo is not removed until you sign off
or use the PURGE command.

Example:
   DEL 1-10,14-17
   DEL ALL