TIdIMAP4SearchKey = (
  skAll,
  skAnswered,
  skBcc,
  skBefore,
  skBody,
  skCc,
  skDeleted,
  skDraft,
  skFlagged,
  skFrom,
  skHeader,
  skKeyword,
  skLarger,
  skNew,
  skNot,
  skOld,
  skOn,
  skOr,
  skRecent,
  skSeen,
  skSentBefore,
  skSentOn,
  skSentSince,
  skSince,
  skSmaller,
  skSubject,
  skText,
  skTo,
  skUID,
  skUnanswered,
  skUndeleted,
  skUndraft,
  skUnflagged,
  skUnKeyWord,
  skUnseen
);