$id
$id : int
Message sequence number
Struct representing an e-mail message header
$id : int
Message sequence number
$uid : int
Message unique identifier
$subject : string
Message subject
$from : string
Message sender (From)
$to : string
Message recipient (To)
$cc : string
Message additional recipients (Cc)
$replyto : string
Message Reply-To header
$in_reply_to : string
Message In-Reply-To header
$date : string
Message date (Date)
$messageID : string
Message identifier (Message-ID)
$size : int
Message size
$encoding : string
Message encoding
$charset : string
Message charset
$ctype : string
Message Content-type
$timestamp : int
Message timestamp (based on message date)
$bodystructure : string
IMAP bodystructure string
$internaldate : string
IMAP internal date
$references : string
Message References header
$priority : int
Message priority (X-Priority)
$mdn_to : string
Message receipt recipient
$folder : string
IMAP folder this message is stored in
$others : array
Other message headers
$flags : array
Message flags
$obj_headers : array
Header name to rcube_message_header object property map