BCC <string>
	 Messages that contain the specified string in the envelope
	 structure's BCC field.

  BEFORE <date>
	 Messages whose internal date (disregarding time and timezone)
	 is earlier than the specified date.

  BODY <string>
	 Messages that contain the specified string in the body of the
	 message.

  CC <string>
	 Messages that contain the specified string in the envelope
	 structure's CC field.

  DELETED
	 Messages with the \Deleted flag set.

  DRAFT
	 Messages with the \Draft flag set.

  FLAGGED
	 Messages with the \Flagged flag set.

  FROM <string>
	 Messages that contain the specified string in the envelope
	 structure's FROM field.

  HEADER <field-name> <string>
	 Messages that have a header with the specified field-name (as
	 defined in [RFC-2822]) and that contains the specified string
	 in the text of the header (what comes after the colon).  If the
	 string to search is zero-length, this matches all messages that
	 have a header line with the specified field-name regardless of
	 the contents.

  KEYWORD <flag>
	 Messages with the specified keyword flag set.

  LARGER <n>
	 Messages with an [RFC-2822] size larger than the specified
	 number of octets.

  NEW
	 Messages that have the \Recent flag set but not the \Seen flag.
	 This is functionally equivalent to "(RECENT UNSEEN)".

  NOT <search-key>
	 Messages that do not match the specified search key.

  OLD
	 Messages that do not have the \Recent flag set.  This is
	 functionally equivalent to "NOT RECENT" (as opposed to "NOT
	 NEW").

  ON <date>
	 Messages whose internal date (disregarding time and timezone)
	 is within the specified date.

  OR <search-key1> <search-key2>
	 Messages that match either search key.

  RECENT
	 Messages that have the \Recent flag set.

  SEEN
	 Messages that have the \Seen flag set.

  SENTBEFORE <date>
	 Messages whose [RFC-2822] Date: header (disregarding time and
	 timezone) is earlier than the specified date.

  SENTON <date>
	 Messages whose [RFC-2822] Date: header (disregarding time and
	 timezone) is within the specified date.

  SENTSINCE <date>
	 Messages whose [RFC-2822] Date: header (disregarding time and
	 timezone) is within or later than the specified date.

  SINCE <date>
	 Messages whose internal date (disregarding time and timezone)
	 is within or later than the specified date.

  SMALLER <n>
	 Messages with an [RFC-2822] size smaller than the specified
	 number of octets.

  SUBJECT <string>
	 Messages that contain the specified string in the envelope
	 structure's SUBJECT field.

  TEXT <string>
	 Messages that contain the specified string in the header or
	 body of the message.

  TO <string>
	 Messages that contain the specified string in the envelope
	 structure's TO field.

  UID <sequence set>
	 Messages with unique identifiers corresponding to the specified
	 unique identifier set.  Sequence set ranges are permitted.

  UNANSWERED
	 Messages that do not have the \Answered flag set.

  UNDELETED
	 Messages that do not have the \Deleted flag set.

  UNDRAFT
	 Messages that do not have the \Draft flag set.

  UNFLAGGED
	 Messages that do not have the \Flagged flag set.

  UNKEYWORD <flag>
	 Messages that do not have the specified keyword flag set.

  UNSEEN
	 Messages that do not have the \Seen flag set.