Bruno Wolff III bruno at wolff.to
Tue Nov 30 13:23:50 UTC 2010


On Tue, Nov 30, 2010 at 22:18:54 +1030,
  Tim <ignored_mailbox at yahoo.com.au> wrote:
> 
> The current email systems don't have any way to enforce correct
> identification of a sender.  So you can write (almost) whatever you like
> in the "from" address header.  It may have to be potentially valid,
> depending on the checks done by a mail server, but they only check that
> the address is well-formed, not whether it's actually correct.

Mailman checks the envelope sender address. That may have been what you
were referring to above (as a from line gets inserted in mbox formatted
messages), but can be confused with the from header in a message. The
envelope sender and recipient addresses are actually independent of the
headers in message, though in typical use they will be derived from the
headers of th original message.


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