ALL All messages in the mailbox; the default initial key for ANDing.

ANSWERED  Messages with the \Answered flag set.

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.

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. T

EXT <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.

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.

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