on of a {packet}, preceding the actual data,

containing source and destination addresses, error checking and other fields.

2. The part of an electronic mail message or news article that precedes the body of a message and contains, among other things, the sender's name and e-mail address and the date and time the message was sent.

Nearby terms:

on of a {packet}, preceding the actual data, in HNF may contain redexes in argument postions

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