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:: ALTER READLOCK ::
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Syntax: A(LTER) REA(DLOCK) [ 0 | 1 | 2 ]
(default: 0)

If you do not want that everyone can read your mails, you can reduce this
using this command.

  ALTER READLOCK 0  everyone can read all your mails
  ALTER READLOCK 1  at DIR/LIST/READ only own mails and mails that are already
                    read appear
  ALTER READLOCK 2  at DIR/LIST/READ only own mails appear

See HELP ALTER PW