Quoting Waider <waider at dspsrv.com>:
> The 'From ' line is a unixism, which traditionally contains the sender
> envelope address (MAIL FROM value). You will note that the POP protocol,
> for example, doesn't give you access to the 'From ' header, only
> the 'From:' header.
Most importantly (?) it's how some mail programs (e.g. pine) identify the start
of a message in a mailbox file: one or more blank lines followed by a line
starting with 'From '. Useful if you've ever had to reconstitute a
scrambled mailfile by hand.
Ronan
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