P1 header (Angleško)
Noun
The information contained in an email message that is required to send and deliver a message between messaging servers by using SMTP protocol commands. The message envelope contains the sender email address and the recipient email 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."
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