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конверт сообщения stresses
comp., MS	message envelope (" The information contained in an e-mail message that is required to send and deliver a message between messaging servers by using SMTP protocol commands. The message envelope contains the sender e-mail address and the recipient e-mail address information. Recipients never see the message envelope, because it is not part of the message content, and it is discarded when the message reaches its destination. The X.400 messaging standard equivalent to the message envelope is called the "P1 header." The message envelope is often referred to as the "P1 header.")
media.	message envelope (часть сообщения, содержимое которой меняется в процессе передачи, идентифицирует отправителя и получателей сообщения, маршрут передачи и характеризует содержимое сообщения)

конверт сообщения: 6 phrases in 4 subjects

Information security and data protection	1
Mass media	1
Microsoft	3
Security systems	1