Địa chỉ của người nhận tin nhắn ban đầu (s). Địa chỉ của người nhận tin nhắn thứ hai (s). Carbon bản sao. Bcc Địa chỉ của người nhận tin nhắn thứ hai (s). Bản sao ẩn. Từ Địa chỉ của người khởi tin nhắn. Ngày ngày và thời gian khi tin nhắn được gửi. Message-ID Một định danh duy nhất cho tin nhắn. | 254 Mobile Messaging Technologies and Services Table Message envelope header parameters1 Parameter name Description To Cc Address of primary message recipient s . Address of secondary message recipient s . Carbon copy. Bcc Address of secondary message recipient s . Blind carbon copy. From Date Message-ID Address of message originator. Date and time when the message was sent. A unique identifier for the message. This helps correlating delivery and read reports with the original message. Subject X-Mms-Expiry Subject of the message. Validity period of the message. After this date MMSCs can discard the message if it has not yet been delivered to the recipient. X-Mms-Delivery-Time The message originator can specify an earliest delivery time for the message. X-Mms-Distribution-Indicator A value-added service provider may use this flag to indicate that the message cannot be redistributed freely. X-Mms-Reply-Charging Whether or not the message originator has requested reply charging. X-Mms-Reply-Charging-Deadline The reply must be sent before the specified deadline for the reply to be paid for by the message originator. X-Mms-Reply-Charging-Size The size of the message must be smaller than the specified size for the reply to be paid for by the message originator. X-Mms-Reply-Charging-ID X-Mms-Delivery-Report A unique identifier for the reply charging transaction. Whether or not the message originator requested a delivery report to be generated. X-Mms-Read-Reply Whether or not the message originator requested a read report to be generated. X-Mms-Message-Class The class of the message auto personal informational advertisement . X-Mms-Priority X-Mms-Sender-Visibility The priority of the message low medium or high . Whether or not the message originator requested his her address to be hidden from recipients. Content-type The content type of the message. A description of values that can be assigned to this parameter is provided below in this section. 1 For the sake of .